Feature/java 21

[denis-yuen]

Description
Make the CLI build compatible with Java 21.
Does not switch to only Java 21, yet

Review Instructions
Describe if this ticket needs review and if so, how one may go about it in qa and/or staging environments.
For example, a ticket based on Security Hub, Snyk, or Dependabot may not need review since those services
will generate new warnings if the issue has not been resolved properly. On the other hand, an infrastructure
ticket that results in visible changes to the end-user will definitely require review.
Many tickets will likely be between these two extremes, so some judgement may be required.

Issue
https://ucsc-cgl.atlassian.net/browse/SEAB-6611

Security
If there are any concerns that require extra attention from the security team, highlight them here.

Please make sure that you've checked the following before submitting your pull request. Thanks!

• Check that you pass the basic style checks and unit tests by running ./mvnw clean install
• If this PR is for a user-facing feature, create and link a documentation ticket for this feature (usually in the same milestone as the linked issue). Style points if you create a documentation PR directly and link that instead.

[github-advanced-security]

This pull request sets up GitHub code scanning for this repository. Once the scans have completed and the checks have passed, the analysis results for this pull request branch will appear on this overview. Once you merge this pull request, the 'Security' tab will show more code scanning analysis results (for example, for the default branch). Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results. For more information about GitHub code scanning, check out the documentation.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.01%. Comparing base (b19b60e) to head (69e685e).

Additional details and impacted files

@@              Coverage Diff              @@
##             develop     #293      +/-   ##
=============================================
- Coverage      70.25%   70.01%   -0.25%     
+ Complexity      1074     1059      -15     
=============================================
  Files             47       47              
  Lines           6069     6069              
  Branches         801      801              
=============================================
- Hits            4264     4249      -15     
- Misses          1470     1475       +5     
- Partials         335      345      +10     

Flag	Coverage Δ
bitbuckettests	9.83% <ø> (ø)
confidentialtooltests	55.54% <ø> (-0.35%)	⬇️
confidentialworkflowtests	30.23% <ø> (-0.04%)	⬇️
nonconfidentialtests	32.27% <ø> (-0.14%)	⬇️
singularitytests	16.59% <ø> (ø)
unittests	8.35% <ø> (ø)

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