refactor: Default to UTC when parsing dates without a known timezone #6321

Job	Run time
External Tests	1m 52s
Test on 3.8 (tests) / ubuntu-latest / SQLAlchemy: 2	38s
Test on 3.9 (tests) / ubuntu-latest / SQLAlchemy: 2	36s
Test on 3.10 (tests) / ubuntu-latest / SQLAlchemy: 2	42s
Test on 3.11 (tests) / ubuntu-latest / SQLAlchemy: 2	42s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 2	39s
Test on 3.8 (tests) / macos-latest / SQLAlchemy: 2	1m 22s
Test on 3.9 (tests) / macos-latest / SQLAlchemy: 2	40s
Test on 3.10 (tests) / macos-latest / SQLAlchemy: 2	42s
Test on 3.11 (tests) / macos-latest / SQLAlchemy: 2	36s
Test on 3.12 (tests) / macos-latest / SQLAlchemy: 2	38s
Test on 3.8 (tests) / windows-latest / SQLAlchemy: 2	1m 48s
Test on 3.9 (tests) / windows-latest / SQLAlchemy: 2	2m 11s
Test on 3.10 (tests) / windows-latest / SQLAlchemy: 2	1m 33s
Test on 3.11 (tests) / windows-latest / SQLAlchemy: 2	1m 54s
Test on 3.12 (tests) / windows-latest / SQLAlchemy: 2	1m 52s
Test on 3.12 (tests) / ubuntu-latest / SQLAlchemy: 1	49s
Test on 3.12 (doctest) / ubuntu-latest / SQLAlchemy: 2	31s
Test on 3.12 (mypy) / ubuntu-latest / SQLAlchemy: 2	44s
Test on 3.12 (deps) / ubuntu-latest / SQLAlchemy: 2	23s
Coverage	23s
	21m 15s

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