Bump third_party/pigweed/repo from `ce0e3e2` to `c12c17d` #102719

Job	Run time
Build framework (macos-release, -sdk macosx -configuration Release)	29m 48s
Build framework (macos-release, -sdk macosx -configuration Release)	29m 48s
Build framework (ios-release, -sdk iphoneos -configuration Release)	20m 48s
Build framework (ios-release, -sdk iphoneos -configuration Release)	20m 48s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	16m 58s
Build framework (tvos-debug, -sdk appletvos -configuration Debug)	16m 58s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	22m 46s
Build framework (watchos-debug, -sdk watchos -configuration Debug)	22m 46s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	39m 26s
Run framework tests (asan, -enableAddressSanitizer YES -enableUndefinedBehaviorSanitizer YES)	39m 26s
Run framework tests (tsan, -enableThreadSanitizer YES)	52m 29s
Run framework tests (tsan, -enableThreadSanitizer YES)	43m 23s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	39m 29s
Run framework tests (leaks, ENABLE_LEAK_DETECTION=1)	39m 29s
	7h 14m 22s

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