Update azul/zulu-openjdk Docker tag to v26

[renovate]

This PR contains the following updates:

Package	Update	Change
azul/zulu-openjdk	major	25 → 26

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.94%. Comparing base (271c8dc) to head (344e355).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #8473       +/-   ##
=============================================
+ Coverage     78.51%   90.94%   +12.43%     
- Complexity     8601    10210     +1609     
=============================================
  Files          1013     1013               
  Lines         29148    27175     -1973     
  Branches       3631     3184      -447     
=============================================
+ Hits          22885    24714     +1829     
+ Misses         5420     1734     -3686     
+ Partials        843      727      -116     

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[renovate]

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[jack-berg]

FYI, this PR originally updated to java 26, which isn't available via graal yet. I usurped this PR and used it to: revert to 25 for graal build, update renovate to update graal java version and java version independently.