deps: unpin pydantic #5481

Job	Run time
build (windows-latest)	16m 50s
check (macos-latest)	10m 13s
build (macos-latest)	11m 48s
build_with_no_default_features (macos-latest)	2m 57s
unit	56m 1s
check (ubuntu-latest)	6m 48s
Verify MSRV	3m 26s
build (ubuntu-latest)	56m 2s
build_with_no_default_features (ubuntu-latest)	42s
build_with_no_default_features (windows-latest)	4m 47s
	2h 49m 34s

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