Relax codecov checks

[MRichards99]

Description

A small change to relax codecov checks so they don't fail so often - hopefully this means that when they do fail, we actually pay attention to them! The config matches that on SciGateway (see https://github.com/ral-facilities/scigateway/blob/develop/codecov.yml).

I've checked the config is valid by following the instructions at https://docs.codecov.com/docs/codecov-yaml#validate-your-repository-yaml

• Review code
• Check GitHub Actions build
• If icatdb Generator Script Consistency Test CI job fails, is this because of a deliberate change made to the script to change generated data (which isn't actually a problem) or is here an underlying issue with the changes made?
• Review changes to test coverage
• Does this change mean a new patch, minor or major version should be made? If so, does one of the commit messages feature fix:, feat: or BREAKING CHANGE: so a release is automatically made via GitHub Actions upon merge?
• {more steps here}

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (9921b53) 96.84% compared to head (65f9a39) 96.84%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #419   +/-   ##
=======================================
  Coverage   96.84%   96.84%           
=======================================
  Files          40       40           
  Lines        3363     3363           
  Branches      316      316           
=======================================
  Hits         3257     3257           
  Misses         78       78           
  Partials       28       28           

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