Pin bazel version to version 6 in MacOS #4087

Job	Run time
ClangTidy	1h 29m 11s
x86_64 test	3m 50s
KytheVerification	5s
MacOsBuild	30m 45s
arm64 test	4m 36s
x86_64 test-nortti	3m 56s
KytheXrefs	0s
x86_64 test-c++20	3m 55s
MacOsBuildDevTools	9m 46s
x86_64 test-c++23	3m 37s
Generate Build matrix	5s
x86_64 smoke-test	14m 33s
PrepareVSPlugin	2m 8s
arm64 smoke-test	14m 38s
VerifyFormatting	3m 49s
x86_64 smoke-test-analyzer	17m 45s
WindowsBuild	14m 15s
arm64 smoke-test-analyzer	17m 31s
x86_64 asan	22m 21s
x86_64 asan-clang	7m 52s
x86_64 compile	3m 35s
arm64 compile	4m 25s
x86_64 compile-clang	3m 24s
arm64 compile-clang	4m 47s
x86_64 compile-static	5m 9s
arm64 compile-static	4m 58s
x86_64 compile-static-clang	3m 54s
arm64 compile-static-clang	4m 2s
x86_64 coverage	14m 27s
x86_64 clean	7m 54s
arm64 clean	7m 2s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	0s
📦 Release	0s
	5h 28m 15s

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