Bump to JDK 25 / Gradle 9.1 (MINOR)

[will-molloy]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.72%. Comparing base (f09b148) to head (22f922c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #262   +/-   ##
=========================================
  Coverage     72.72%   72.72%           
  Complexity        4        4           
=========================================
  Files             3        3           
  Lines            11       11           
=========================================
  Hits              8        8           
  Misses            1        1           
  Partials          2        2           

Flag	Coverage Δ
integration-tests-macos-latest	80.00% <ø> (ø)
integration-tests-ubuntu-latest	80.00% <ø> (ø)
integration-tests-windows-latest	80.00% <ø> (ø)
unit-tests-macos-latest	72.72% <ø> (ø)
unit-tests-ubuntu-latest	72.72% <ø> (ø)
unit-tests-windows-latest	72.72% <ø> (ø)

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[will-molloy]

Waiting on Kotlin 2.3