[Backport-2.x] Added @dbwiddis to OpenSearch maintainers

[owaiskazi19]

Description

Backport of #7665

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

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: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString

• URL: https://build.ci.opensearch.org/job/gradle-check/16123/
• CommitID: fc5b039
  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 #7710 (fc5b039) into 2.x (f61d354) will decrease coverage by 0.11%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x    #7710      +/-   ##
============================================
- Coverage     70.36%   70.26%   -0.11%     
  Complexity    60151    60151              
============================================
  Files          4899     4899              
  Lines        289129   289129              
  Branches      41991    41991              
============================================
- Hits         203459   203157     -302     
- Misses        68642    68976     +334     
+ Partials      17028    16996      -32     

see 495 files with indirect coverage changes