update maintainers list

[cgchinmay]

Description

[Describe what this change achieves]
In interest of other responsibilities, I haven't been able to actively work on this repo, so would like to remove myself from the maintainers list

Issues Resolved

[List any issues this PR will resolve]
NA

Testing

NA

[Describe how this change was tested]
NA

Backport to Branches:

NA

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[opensearch-trigger-bot]

The backport to 7 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-7 7
# Navigate to the new working tree
pushd ../.worktrees/backport-7
# Create a new branch
git switch --create backport/backport-561-to-7
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 c4adf2a5ad5723228ef2ed7333393ae61bcccc78
# Push it to GitHub
git push --set-upstream origin backport/backport-561-to-7
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/backport-7

Then, create a pull request where the base branch is 7 and the compare/head branch is backport/backport-561-to-7.