Bump gradle.plugin.com.github.johnrengelman:shadow from 7.1.2 to 8.0.0

[dependabot]

Bumps gradle.plugin.com.github.johnrengelman:shadow from 7.1.2 to 8.0.0.

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

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[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/14686/
• CommitID: a552776
  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?

[kotwanikunal]

@dependabot recreate

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/14741/
• CommitID: df1d098

[codecov-commenter]

Codecov Report

Merging #7340 (a0dcd54) into main (18390f9) will decrease coverage by 0.05%.
The diff coverage is n/a.

📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more

@@             Coverage Diff              @@
##               main    #7340      +/-   ##
============================================
- Coverage     70.69%   70.64%   -0.05%     
+ Complexity    59568    59558      -10     
============================================
  Files          4862     4862              
  Lines        285642   285642              
  Branches      41145    41145              
============================================
- Hits         201944   201804     -140     
- Misses        67087    67258     +171     
+ Partials      16611    16580      -31     

see 472 files with indirect coverage changes

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      1 org.opensearch.search.backpressure.SearchBackpressureIT.testSearchShardTaskCancellationWithHighCpu

• URL: https://build.ci.opensearch.org/job/gradle-check/14742/
• CommitID: a0dcd54
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[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:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/backport-2.x 2.x
# Navigate to the new working tree
pushd ../.worktrees/backport-2.x
# Create a new branch
git switch --create backport/backport-7340-to-2.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 a0c062a7beacd62d4575f7ac44e558b0fbed4861
# Push it to GitHub
git push --set-upstream origin backport/backport-7340-to-2.x
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-2.x

Then, create a pull request where the base branch is 2.x and the compare/head branch is backport/backport-7340-to-2.x.