Address some warnings

[MetRonnie]

Spotted in pytest output

datetime.utcnow()

Deprecated since version 3.12: Use datetime.now() with UTC instead.

Note

There is a risk with this because using comparison operators (e.g. <) between timezone-aware and naive (timezone-unaware) datetimes results in a type error. However I do not think we are doing any such comparisons, and all the tests are passing.

sqlite3.connect():

Changed in version 3.13: Positional use of the parameters timeout, detect_types, isolation_level, check_same_thread, factory, cached_statements, and uri is deprecated. They will become keyword-only parameters in Python 3.15.

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• No dependency changes
• No tests/docs/changelog needed
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.

[oliver-sanders]

@hjoliver, this PR removes a code block that isn't used any more. Can you have a quick look at it and merge if ok.