Bump sqlalchemy version

[soapy1]

Fixes #931

Description

The upgrade path from sqlalchemy 1.4 -> 2.0 was designed to have a seamless upgrade path. This PR updates:

• the project dependency
• the conda recipe
• updates how some tests are formed to ensure that test objects are properly created
• updates sql alchemy types as per https://docs.sqlalchemy.org/en/20/changelog/whatsnew_20.html#migrating-an-existing-mapping

Docs: https://docs.sqlalchemy.org/en/20/changelog/migration_20.html#the-1-4-2-0-migration-path

Pull request checklist

• Did you test this change locally?
• Did you update the documentation (if required)?
• Did you add/update relevant tests for this change (if required)?

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[peytondmurray]

Looks good - the tests will tell us whether there were any issues with the annotations. A few other minor comments, but on the whole this is brilliant - thank you! 🚀