build(deps): bump golang.org/x/oauth2 from 0.14.0 to 0.15.0 #2886

Job	Run time
staticcheck	43s
build	38s
lint	27s
tests (macos/go-1.20-amd64)	1m 45s
tests (ubuntu/go-1.20-386)	44s
tests (ubuntu/go-1.20-amd64)	51s
tests (windows/go-1.20-386)	1m 40s
tests (windows/go-1.20-amd64)	3m 30s
tests (macos/go-1.21-amd64)	1m 40s
tests (ubuntu/go-1.21-386)	39s
tests (ubuntu/go-1.21-amd64)	47s
tests (windows/go-1.21-386)	2m 52s
tests (windows/go-1.21-amd64)	1m 51s
test-python-example	32s
test-gsutil-example	38s
test-node-example	13s
test-go-example	35s
test-dotnet-example	16s
test-scala-example	33s
test-java-example	19s
test-cpp-example	2m 15s
test-curl-example	5s
test-curl-both-scheme-default-ports-example	8s
test-curl-both-scheme-non-default-ports-example	8s
unblock-pr	1s
	23m 50s

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