Update java-version to 17 for Jenkins Security Scan

[strangelookingnerd]

With jenkinsci/jenkins#9358 in effect, it makes sense to upgrade the action to run with Java 17.

Testing done

None.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[strangelookingnerd]

It appears that this plugin still requires Java 8.
Feel free to ignore this PR in case an upgrade to a more recent Java version is not desired.