Use updated `twined`

Contents (#650)

IMPORTANT: There is 1 breaking change.

Enhancements

• Include received invalid data in flask app error messages
• Allow any iterable for Dataset files argument

Fixes

• Ensure order argument is given in Service.send_exception
• Add workaround for apparent bug in getting local metadata file's absolute path
• Remove (now-) unnecessary json decoding in get_events

Dependencies

• 💥 BREAKING CHANGE: Drop support for python3.7
• Use twined==0.5.5
• Update to black==24.4.2

Testing

• Remove unnecessary test
• Update asynchronous deployment test to accept numpy array as output values

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Upgrade instructions

💥 Drop support for python3.7

Upgrade to python>=3.8 to keep using octue.