Change spotbugs from 6.25.0 to 6.16.0

[prudhvigodithi]

Description

The spot bugs 6.25.0 gradle plugin making internet calls https://download.eclipse.org/ and fails to fetch the right JDT jars making the builds fail for internet restricted environments.

Here is an open issue from plugin: https://github.com/diffplug/spotless/issues/1996 where it does not honor local JDT jars .

Issues Resolved

[List any issues this PR will resolve]

Check List

• [ ] New functionality includes testing.
  • [ ] All tests pass
• [ ] New functionality has been documented.
  • [ ] New functionality has javadoc added
• [ ] Commits are signed per the DCO using --signoff

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[prudhvigodithi]

Closing this PR as 6.16.0 does not support JDK21.