Pin bazel version to version 6 in MacOS #4083

Job	Run time
KytheXrefs	0s
ClangTidy	1h 24m 34s
KytheVerification	32s
x86_64 test	12m 44s
MacOsBuild	26s
MacOsBuildDevTools	2m 24s
arm64 test	12m 10s
Generate Build matrix	4s
x86_64 test-nortti	13m 2s
PrepareVSPlugin	2m 11s
x86_64 test-c++20	15m 51s
VerifyFormatting	1m 52s
x86_64 test-c++23	16m 1s
WindowsBuild	12m 59s
x86_64 smoke-test	13m 56s
arm64 smoke-test	14m 17s
x86_64 smoke-test-analyzer	17m 23s
arm64 smoke-test-analyzer	17m 39s
x86_64 asan	22m 29s
x86_64 asan-clang	17m 14s
x86_64 compile	12m 5s
arm64 compile	6m 59s
x86_64 compile-clang	6m 54s
arm64 compile-clang	7m 22s
x86_64 compile-static	7m 11s
arm64 compile-static	7m 0s
x86_64 compile-static-clang	6m 55s
arm64 compile-static-clang	7m 32s
x86_64 coverage	17m 31s
x86_64 clean	7m 1s
arm64 clean	6m 38s
Build ·${{ matrix.arch }}:${{ matrix.os }}:${{ matrix.ver }}${{ (((matrix.link == 'static') && ':static') \|\| '') }}	0s
Build and deploy GitHub pages	0s
📦 Release	0s
	6h 10m 56s

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