Fix unit tests

[merelcht]

Description

#1412

Development notes

This issue is caused by updating moto which I'd experienced earlier on when adding support for Python 3.10 (see point 1 in the development notes).

moto was bumped in the release process: https://github.com/kedro-org/kedro/pull/1398/files, but not necessarily because it was a change required for any functionality.

Things that fix this issue:

1. Revert the bumping of moto
2. Run all tests sequentially ⚠️ This will add significant build time to all builds
3. Run most tests in parallel and only the test_partitioned_dataset.py and test_incremental_dataset.py sequentially. ⚠️ If we do this we won't be able to run the code coverage check as part of the build.

I went for option 1.

Checklist

• Read the contributing guidelines
• Opened this PR as a 'Draft Pull Request' if it is work-in-progress
• Updated the documentation to reflect the code changes
• Added a description of this change in the RELEASE.md file
• Added tests to cover my changes

[noklam]

Thank you for fixing our CI🎉

[SajidAlamQB]

Thank you for investigating this! 🎉