Add compatibility date for Pyodide 0.27.1 #10994

Job	Run time
lint / bazel	2m 15s
fixup / block-fixup	5s
labels / InternalPRRequired	1s
test (linux, ubuntu-20.04, -asan) / bazel	2m 6s
test (linux, ubuntu-20.04) / bazel	2m 12s
test (linux, ubuntu-20.04, -debug) / bazel	2m 17s
test (macOS, macos-15) / bazel	2m 32s
test (windows, windows-2022) / bazel	13m 4s
	24m 32s

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