Update dependency java to v26

[renovate]

This PR contains the following updates:

Package	Update	Change
java	major	25 → 26

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.88%. Comparing base (7b72998) to head (d728aba).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8232   +/-   ##
=========================================
  Coverage     90.88%   90.88%           
  Complexity     7985     7985           
=========================================
  Files           898      898           
  Lines         24107    24107           
  Branches       2406     2406           
=========================================
  Hits          21909    21909           
  Misses         1455     1455           
  Partials        743      743           

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[zeitlinger]

This update looks premature to merge as-is.

The failing CI is not caused by a repo-local code issue. The blocker is the GraalVM setup step for Java 26:

Failed to download graalvm-jdk-26_linux-x64_bin.tar.gz. Are you sure java-version: '26' is correct?

So at the moment graalvm/setup-graalvm does not appear to have a usable Java 26 artifact for this workflow. Until that upstream support exists, this Renovate bump is going to stay red.

I’d suggest closing or deferring this PR until Java 26 is actually available in the GraalVM action path used here.