Work around JDK 21.0.2 bug impacting scaling executors

[dbwiddis]

Description

Restricts CI GitHub Actions to run on JDK 21.0.1 until https://bugs.openjdk.org/browse/JDK-8323659 is released and deployed to runners.

Issues Resolved

Fixes #426

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (db9a325) 71.72% compared to head (50e21e7) 71.87%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #429      +/-   ##
============================================
+ Coverage     71.72%   71.87%   +0.15%     
- Complexity      618      619       +1     
============================================
  Files            78       78              
  Lines          3133     3133              
  Branches        238      238              
============================================
+ Hits           2247     2252       +5     
+ Misses          778      774       -4     
+ Partials        108      107       -1     

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[owaiskazi19]

JDK 21 😓

[opensearch-trigger-bot]

The backport to 2.x failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/flow-framework/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/flow-framework/backport-2.x
# Create a new branch
git switch --create backport/backport-429-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 42e4cd4e231d526aa37f9699f7c6a667706af3d6
# Push it to GitHub
git push --set-upstream origin backport/backport-429-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/flow-framework/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-429-to-2.x.

[joshpalis]

@dbwiddis Does this need to be backported to 2.x? I dont see any usage of JDK 21 within our 2.x CI, however I do see JDK 21 being used for our 2.x security test workflow here. Now I'm curious if we should even be testing security with JDK 21 for our security enabled integration tests for 2.x since we're not using it for the other workflows.

Looking at our 2.x CI, seems security tests with JDK 21 are failing : https://github.com/opensearch-project/flow-framework/actions/runs/7593631134/job/20684298446. Ill raise a PR to remove this