tools: fix parsing of commit trailers in `lint-release-proposal` GHA #3880

Job	Run time
Build slim tarball	2m 29s
x86_64-darwin: with shared libraries	43m 45s
x86_64-linux: with shared libraries	26m 45s
aarch64-linux: with shared libraries	23m 24s
aarch64-darwin: with shared libraries	23m 12s
	1h 59m 35s

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