Add .git-blame-ignore-revs #2090

Job	Run time
msrv / prepare	4s
test / prepare	1s
miri / miri	29s
tidy / prepare	4s
test / test (stable)	20s
test / test (beta)	19s
test / test (nightly)	45s
test / test (nightly, macos-latest)	52s
test / test (nightly, windows-latest)	1m 29s
msrv / build (ubuntu-latest)	9m 3s
msrv / build (windows-latest)	9m 30s
tidy / tidy	2m 33s
tidy / deny	13s
tidy / clippy	12s
tidy / check-external-types	0s
tidy / codegen	0s
tidy / docs / docs	11s
	26m 5s

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