Fix tiny misformatting in the comments left by the stale issue GitHub Actions workflow

[mhucka]

The comment on GitHub are ending up without a break between paragraphs. I seems to require two blank lines in YAML.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.13%. Comparing base (3d6227f) to head (93cbd15).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7180      +/-   ##
==========================================
- Coverage   98.13%   98.13%   -0.01%     
==========================================
  Files        1095     1095              
  Lines       95649    95649              
==========================================
- Hits        93867    93866       -1     
- Misses       1782     1783       +1     

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