[Backport 2.x] Add Michael Froh as a maintainer (#9463)

[andrross]

Backports 89ccda9 from #9463 to 2.x.

This brings the 2.x MAINTAINERS.md file in line with the version on main as I think another change was not backported, hence the conflict on cherry-pick.

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]

Compatibility status:

Checks if related components are compatible with change 61f2adb

Incompatible components

Incompatible components: [https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/performance-analyzer.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/alerting.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/performance-analyzer-rca.git]

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/23629/
• CommitID: 61f2adb

[codecov]

Codecov Report

Merging #9583 (61f2adb) into 2.x (7a0b4c5) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #9583      +/-   ##
============================================
+ Coverage     70.78%   70.79%   +0.01%     
- Complexity    57625    57657      +32     
============================================
  Files          4769     4769              
  Lines        272493   272493              
  Branches      40123    40123              
============================================
+ Hits         192871   192919      +48     
+ Misses        63121    63095      -26     
+ Partials      16501    16479      -22     

see 475 files with indirect coverage changes