Bump spock-core from 2.1-groovy-3.0 to 2.3-groovy-3.0

[kartg]

Description

Manual backport of #5315 to bump the minor version of spock-core

Related Issues

N/A

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
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/17813/
• CommitID: 729715b
  Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green.
  Is the failure a flaky test unrelated to your change?

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.remotestore.SegmentReplicationUsingRemoteStoreIT.testDropPrimaryDuringReplication

• URL: https://build.ci.opensearch.org/job/gradle-check/17814/
• CommitID: 00cd200
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Merging #8122 (00cd200) into 2.x (59a62e7) will increase coverage by 0.05%.
The diff coverage is 84.61%.

@@             Coverage Diff              @@
##                2.x    #8122      +/-   ##
============================================
+ Coverage     70.63%   70.69%   +0.05%     
- Complexity    56771    56788      +17     
============================================
  Files          4703     4703              
  Lines        269046   269056      +10     
  Branches      39768    39770       +2     
============================================
+ Hits         190048   190199     +151     
+ Misses        62694    62474     -220     
- Partials      16304    16383      +79     

Impacted Files	Coverage Δ
.../org/opensearch/common/settings/SecureSetting.java	74.62% <84.61%> (+9.71%)	⬆️

... and 449 files with indirect coverage changes