build(deps): bump github.com/gorilla/mux from 1.8.0 to 1.8.1 #2857

Job	Run time
lint	26s
staticcheck	1m 36s
tests (macos/go-1.20-amd64)	1m 49s
build	1m 8s
tests (ubuntu/go-1.20-386)	1m 3s
tests (ubuntu/go-1.20-amd64)	57s
tests (windows/go-1.20-386)	1m 40s
tests (windows/go-1.20-amd64)	4m 2s
tests (macos/go-1.21-amd64)	2m 9s
tests (ubuntu/go-1.21-386)	59s
tests (ubuntu/go-1.21-amd64)	1m 18s
tests (windows/go-1.21-386)	3m 4s
tests (windows/go-1.21-amd64)	3m 49s
test-python-example	50s
test-gsutil-example	38s
test-node-example	17s
test-go-example	36s
test-dotnet-example	22s
test-scala-example	34s
test-java-example	19s
test-cpp-example	2m 20s
test-curl-example	6s
test-curl-both-scheme-default-ports-example	7s
test-curl-both-scheme-non-default-ports-example	20s
unblock-pr	1s
	30m 30s

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