Add missing to_type_hint to WindowedValueCoder #30860

Job	Run time
Build python source distribution	53s
Check environment variables	18s
Build python cp39- wheels on auto for ubuntu-20.04	13m 57s
Prepare GCS	0s
Build python cp310- wheels on auto for ubuntu-20.04	21m 59s
Build python cp311- wheels on auto for ubuntu-20.04	24m 28s
Build python cp312- wheels on auto for ubuntu-20.04	19m 38s
Build python cp39- wheels on auto for macos-13	17s
Build python cp310- wheels on auto for macos-13	18s
Build python cp311- wheels on auto for macos-13	18s
Build python cp312- wheels on auto for macos-13	3m 6s
Build python cp39- wheels on auto for windows-latest	12s
Build python cp310- wheels on auto for windows-latest	19s
Build python cp311- wheels on auto for windows-latest	21s
Build python cp312- wheels on auto for windows-latest	5m 11s
Build python cp39- wheels on aarch64 for ubuntu-20.04	1m 9s
Build python cp310- wheels on aarch64 for ubuntu-20.04	59s
Upload python source distribution to GCS bucket	0s
Build python cp311- wheels on aarch64 for ubuntu-20.04	38s
Build python cp312- wheels on aarch64 for ubuntu-20.04	33m 47s
Branch repo nightly	1s
Upload wheels to GCS bucket	1s
List files on Google Cloud Storage Bucket	1s
	2h 7m 51s

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