chore(deps): bump cloud.google.com/go/spanner from 1.67.0 to 1.68.0

Bumps [cloud.google.com/go/spanner](https://github.com/googleapis/google-cloud-go) from 1.67.0 to 1.68.0.
- [Release notes](https://github.com/googleapis/google-cloud-go/releases)
- [Changelog](https://github.com/googleapis/google-cloud-go/blob/main/CHANGES.md)
- [Commits](googleapis/google-cloud-go@spanner/v1.67.0...spanner/v1.68.0)

---
updated-dependencies:
- dependency-name: cloud.google.com/go/spanner
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

go.mod

@@ -1,7 +1,7 @@
 module github.com/go-testfixtures/testfixtures/v3
 
 require (
-	cloud.google.com/go/spanner v1.67.0
+	cloud.google.com/go/spanner v1.68.0
 	github.com/ClickHouse/clickhouse-go/v2 v2.29.0
 	github.com/denisenkom/go-mssqldb v0.12.3
 	github.com/go-sql-driver/mysql v1.8.1
@@ -16,22 +16,24 @@ require (
 )
 
 require (
-	cel.dev/expr v0.15.0 // indirect
+	cel.dev/expr v0.16.0 // indirect
 	cloud.google.com/go v0.115.1 // indirect
-	cloud.google.com/go/auth v0.9.1 // indirect
+	cloud.google.com/go/auth v0.9.3 // indirect
 	cloud.google.com/go/auth/oauth2adapt v0.2.4 // indirect
 	cloud.google.com/go/compute/metadata v0.5.0 // indirect
-	cloud.google.com/go/iam v1.2.0 // indirect
-	cloud.google.com/go/longrunning v0.6.0 // indirect
+	cloud.google.com/go/iam v1.2.1 // indirect
+	cloud.google.com/go/longrunning v0.6.1 // indirect
+	cloud.google.com/go/monitoring v1.21.0 // indirect
 	filippo.io/edwards25519 v1.1.0 // indirect
 	github.com/ClickHouse/ch-go v0.61.5 // indirect
 	github.com/GoogleCloudPlatform/grpc-gcp-go/grpcgcp v1.5.0 // indirect
+	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.24.1 // indirect
 	github.com/andybalholm/brotli v1.1.0 // indirect
 	github.com/census-instrumentation/opencensus-proto v0.4.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cncf/xds/go v0.0.0-20240423153145-555b57ec207b // indirect
-	github.com/envoyproxy/go-control-plane v0.12.1-0.20240621013728-1eb8caab5155 // indirect
-	github.com/envoyproxy/protoc-gen-validate v1.0.4 // indirect
+	github.com/cncf/xds/go v0.0.0-20240822171458-6449f94b4d59 // indirect
+	github.com/envoyproxy/go-control-plane v0.13.0 // indirect
+	github.com/envoyproxy/protoc-gen-validate v1.1.0 // indirect
 	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/go-faster/city v1.0.1 // indirect
 	github.com/go-faster/errors v0.7.1 // indirect
@@ -42,7 +44,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/google/s2a-go v0.1.8 // indirect
 	github.com/google/uuid v1.6.0 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.2 // indirect
+	github.com/googleapis/enterprise-certificate-proxy v0.3.4 // indirect
 	github.com/googleapis/gax-go/v2 v2.13.0 // indirect
 	github.com/jackc/chunkreader/v2 v2.0.1 // indirect
 	github.com/jackc/pgconn v1.14.3 // indirect
@@ -59,23 +61,25 @@ require (
 	github.com/segmentio/asm v1.2.0 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
 	go.opencensus.io v0.24.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.52.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.53.0 // indirect
-	go.opentelemetry.io/otel v1.28.0 // indirect
-	go.opentelemetry.io/otel/metric v1.28.0 // indirect
-	go.opentelemetry.io/otel/trace v1.28.0 // indirect
-	golang.org/x/crypto v0.26.0 // indirect
-	golang.org/x/net v0.28.0 // indirect
-	golang.org/x/oauth2 v0.22.0 // indirect
-	golang.org/x/sys v0.24.0 // indirect
-	golang.org/x/text v0.17.0 // indirect
+	go.opentelemetry.io/contrib/detectors/gcp v1.29.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.54.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.54.0 // indirect
+	go.opentelemetry.io/otel v1.29.0 // indirect
+	go.opentelemetry.io/otel/metric v1.29.0 // indirect
+	go.opentelemetry.io/otel/sdk v1.29.0 // indirect
+	go.opentelemetry.io/otel/sdk/metric v1.29.0 // indirect
+	go.opentelemetry.io/otel/trace v1.29.0 // indirect
+	golang.org/x/crypto v0.27.0 // indirect
+	golang.org/x/net v0.29.0 // indirect
+	golang.org/x/oauth2 v0.23.0 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
 	golang.org/x/time v0.6.0 // indirect
-	golang.org/x/xerrors v0.0.0-20240716161551-93cc26a95ae9 // indirect
-	google.golang.org/api v0.195.0 // indirect
-	google.golang.org/genproto v0.0.0-20240827150818-7e3bb234dfed // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20240823204242-4ba0660f739c // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240827150818-7e3bb234dfed // indirect
-	google.golang.org/grpc v1.66.0 // indirect
+	google.golang.org/api v0.197.0 // indirect
+	google.golang.org/genproto v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/genproto/googleapis/api v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240903143218-8af14fe29dc1 // indirect
+	google.golang.org/grpc v1.66.2 // indirect
 	google.golang.org/protobuf v1.34.2 // indirect
 )