Fix Postgres alter primary key column statements

[billy1624]

PR Info

• Closes Postgres Backend: the type alias 'bigserial' and 'serial' are not valid in the context of a TableAlterStatement #645

Bug Fixes

• Postgres alter table statement should not use the serial or bigserial shorthand to modify or create primary key columns

[ikrivosheev]

@billy1624 thank you! LGTM!

[github-actions]

🎉 Released In 0.29.0 🎉

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[github-actions]

🎉 Released In 0.29.1 🎉

Thank you everyone for the contribution!
This feature is now available in the latest release. Now is a good time to upgrade!
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