chore(ci): remove EOLd versions from test matrix

[pmalek]

Summary

According to https://docs.konghq.com/gateway/latest/support-policy/#older-versions there's a handful of versions that already reached EOL.

This PR removes them from the test matrix.

Full changelog

• [Implement ...]
• [Fix ...]

Issues resolved

Fix #XXX

Documentation

• Link to the website documentation PR

Testing

• Unit tests
• E2E tests
• Manual testing on Universal
• Manual testing on Kubernetes

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.72%. Comparing base (51de016) to head (0a04f23).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #131   +/-   ##
=======================================
  Coverage   42.72%   42.72%           
=======================================
  Files          75       75           
  Lines        8820     8820           
=======================================
  Hits         3768     3768           
  Misses       4588     4588           
  Partials      464      464           

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