Update github.com/bazelbuild/buildtools digest to 9bdafcf #6405

Job	Run time
Test (7.x, ubuntu-latest, clang)	28m 25s
Test (7.4.0, macos-latest, gcc-14)	40m 45s
Test (latest, ubuntu-latest, gcc-14)	29m 31s
Test (latest, ubuntu-latest, clang)	36m 6s
Test (latest, macos-latest, clang)	28m 33s
Test (7.4.0, ubuntu-latest, gcc-14)	27m 25s
Test (7.4.0, windows-latest, msvc)	32m 37s
Test (7.4.0, windows-latest, clang)	21m 14s
Test (7.4.0, macos-latest, clang)	34m 41s
Test (7.x, ubuntu-latest, gcc-14)	29m 5s
Test (7.x, windows-latest, clang)	24m 15s
Test (7.4.0, ubuntu-latest, clang)	37m 17s
Test (latest, macos-latest, gcc-14)	35m 37s
Test (latest, windows-latest, msvc)	28m 40s
Test (7.x, macos-latest, gcc-14)	33m 53s
Test (7.x, macos-latest, clang)	35m 55s
Test (latest, windows-latest, clang)	23m 55s
Test (7.x, windows-latest, msvc)	33m 22s
	9h 21m 16s

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