Update pull request template to include issue closing functionality

[samadpls]

Fixes #329

Review Checklist
I certify that I have:

• tested my changes
• added/updated automated tests
• updated the changelog
• followed the contribution guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.05%. Comparing base (c8bdbda) to head (1214709).
Report is 52 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #330   +/-   ##
=======================================
  Coverage   89.05%   89.05%           
=======================================
  Files          65       65           
  Lines        3244     3244           
=======================================
  Hits         2889     2889           
  Misses        355      355           

Flag	Coverage Δ
unittests	89.05% <ø> (ø)

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[t1m0thyj]

LGTM, thanks @samadpls!