chore(deps): bump Kong Gateway Enterprise default image to 3.4

[programmer04]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0d57f75) 60.38% compared to head (91c1c84) 56.85%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #867      +/-   ##
==========================================
- Coverage   60.38%   56.85%   -3.53%     
==========================================
  Files          49       49              
  Lines        4024     4024              
==========================================
- Hits         2430     2288     -142     
- Misses       1291     1452     +161     
+ Partials      303      284      -19     

Flag	Coverage Δ
integration-test	56.85% <ø> (-3.53%)	⬇️

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Files	Coverage Δ
pkg/clusters/addons/kong/addon.go	48.24% <ø> (-15.58%)	⬇️

... and 3 files with indirect coverage changes

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