Use apr_palloc/apr_pmemdup rather than malloc/memcpy in mod_tile.c

[hummeltech]

Also:

• Add HEAD request test
• Don't try to build CentOS Stream 9/10 until gdal RPM issue is resolved
  • https://issues.redhat.com/browse/RHEL-134116

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.63%. Comparing base (c4e3e62) to head (51fabcb).
⚠️ Report is 24 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #491      +/-   ##
==========================================
- Coverage   81.54%   80.63%   -0.91%     
==========================================
  Files          24       24              
  Lines        5645     5195     -450     
==========================================
- Hits         4603     4189     -414     
+ Misses       1042     1006      -36     

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