Update PR template

[brynpickering]

Current template doesn't trigger automated issue linking. This should fix that.

Reviewer checklist:

• Test(s) added to cover contribution
• Documentation updated
• Changelog updated
• Coverage maintained or improved

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.83%. Comparing base (872978d) to head (2a8f744).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #589      +/-   ##
==========================================
- Coverage   95.85%   95.83%   -0.02%     
==========================================
  Files          24       24              
  Lines        3619     3628       +9     
  Branches      788      724      -64     
==========================================
+ Hits         3469     3477       +8     
  Misses         86       86              
- Partials       64       65       +1     

[sjpfenninger]

What's the issue this solves?

[brynpickering]

What's the issue this solves?

Previously it was Fixes issue(s) # but this will not link a PR to an issue (and then automatically close that issue when the PR is merged). Now it is simply Fixes # which does link the issue automatically.