Bump version to 1.27.0 (#1496) #5012

Job	Run time
test-latest-deps	10m 10s
cloud-test	1m 45s
check-protos	8m 21s
features-tests / test	8m 16s
build-lint-test (3.10, windows-latest)	16m 40s
build-lint-test (3.10, macos-intel)	17m 1s
build-lint-test (3.10, macos-arm)	6m 46s
build-lint-test (3.14, macos-intel)	30m 42s
build-lint-test (3.14, ubuntu-latest)	17m 36s
build-lint-test (3.14, ubuntu-arm)	10m 41s
build-lint-test (3.10, ubuntu-arm)	10m 59s
build-lint-test (3.14, macos-arm)	6m 48s
build-lint-test (3.10, ubuntu-latest)	13m 41s
build-lint-test (3.14, windows-latest)	18m 57s
	2h 58m 23s

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