🔒️ security: clarify backport policy for older versions

[nstarman]

No description provided.

[Copilot]

Pull request overview

This PR clarifies the security policy for backporting security updates to older major versions. The previous language stated backports would happen "if possible," which was ambiguous. The new language specifies that backports will be considered "if requested and are reasonable," setting clearer expectations about the conditional nature of backport support.

Changes:

• Updated the security policy to clarify that backports to older major versions require both a request and a reasonable assessment

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.82%. Comparing base (1977618) to head (785c077).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #548      +/-   ##
==========================================
- Coverage   96.90%   96.82%   -0.08%     
==========================================
  Files          54       44      -10     
  Lines        2260     2141     -119     
  Branches       82       76       -6     
==========================================
- Hits         2190     2073     -117     
+ Misses         53       52       -1     
+ Partials       17       16       -1     

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