Include priority in Task debug output

[jch-13]

Working on #490, I noticed that the Debug impl of Task does not print the priority field.

Checklist

• I picked the correct source and target branch.
• I included a new entry to the CHANGELOG.md.
• I checked cargo clippy and cargo fmt. The CI will fail otherwise anyway.
• (If applicable) I added tests for this feature or adjusted existing tests.
• (If applicable) I checked if anything in the wiki needs to be changed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (fb6caab) 79.61% compared to head (4d6593b) 79.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #493      +/-   ##
==========================================
- Coverage   79.61%   79.59%   -0.02%     
==========================================
  Files          77       77              
  Lines        5538     5539       +1     
==========================================
  Hits         4409     4409              
- Misses       1129     1130       +1     

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[github-actions]

Test Results

  3 files  +  1   22 suites  +8   2m 48s ⏱️ + 1m 32s
144 tests ±  0  144 ✅ ±  0  0 💤 ±0  0 ❌ ±0 
308 runs  +143  308 ✅ +143  0 💤 ±0  0 ❌ ±0 

Results for commit 4d6593b. ± Comparison against base commit fb6caab.