fix: catch OverflowError in parsedate/parsedatetime recipes (fixes #857)

[KooshaPari]

Fixes #857

Changes

• Catch OverflowError alongside ParserError in both parsedate() and parsedatetime() in sqlite_utils/recipes.py
• Overflow values like "999999999999999999-01-01" now respect the errors= parameter instead of always raising

Testing

• Added test_dateparse_overflow_handled to verify errors=SET_NULL returns None and errors=IGNORE returns the original value for overflow inputs
• Added test_dateparse_overflow_raises to verify the default behavior (no errors=) still raises on overflow
• All 24 tests in test_recipes.py pass

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📚 Documentation preview 📚: https://sqlite-utils--859.org.readthedocs.build/en/859/

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