Bump version to 1.27.0 #5001

Job	Run time
check-protos	9m 0s
test-latest-deps	11m 22s
cloud-test	3m 6s
features-tests / test	8m 9s
build-lint-test (3.10, ubuntu-latest)	14m 11s
build-lint-test (3.14, macos-intel)	16m 11s
build-lint-test (3.10, macos-intel)	15m 10s
build-lint-test (3.10, ubuntu-arm)	13m 13s
build-lint-test (3.14, ubuntu-arm)	12m 21s
build-lint-test (3.14, windows-latest)	17m 56s
build-lint-test (3.10, macos-arm)	11m 39s
build-lint-test (3.10, windows-latest)	19m 30s
build-lint-test (3.14, ubuntu-latest)	18m 42s
build-lint-test (3.14, macos-arm)	12m 14s
	3h 2m 44s

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