Enable JDK 21 builds

[ascopes]

Closes #309

Signed-off-by: Ashley 73482956+ascopes@users.noreply.github.com

[codecov-commenter]

Codecov Report

Merging #310 (f6e5759) into main (ef9c7a8) will not change coverage.
The diff coverage is n/a.

❗ Current head f6e5759 differs from pull request most recent head 1f4d6ad. Consider uploading reports for the commit 1f4d6ad to get more accurate results

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@@           Coverage Diff           @@
##             main     #310   +/-   ##
=======================================
  Coverage   85.80%   85.80%           
=======================================
  Files          93       93           
  Lines        2973     2973           
  Branches      240      240           
=======================================
  Hits         2551     2551           
  Misses        376      376           
  Partials       46       46           

[github-actions]

Test Results

  2 680 files  +   203    2 680 suites  +203   2s ⏱️ ±0s
31 169 tests +2 517  30 874 ✔️ +2 451  269 💤 +40  0 ❌ ±0  26 🔥 +26 
31 505 runs  +2 543  31 210 ✔️ +2 477  269 💤 +40  0 ❌ ±0  26 🔥 +26 

For more details on these errors, see this check.

Results for commit 1f4d6ad. ± Comparison against base commit ef9c7a8.

♻️ This comment has been updated with latest results.