build(deps): bump github.com/opensearch-project/opensearch-go/v4

Bumps [github.com/opensearch-project/opensearch-go/v4](https://github.com/opensearch-project/opensearch-go) from 4.6.0 to 4.7.3.
- [Release notes](https://github.com/opensearch-project/opensearch-go/releases)
- [Changelog](https://github.com/opensearch-project/opensearch-go/blob/v4.7.3/CHANGELOG.md)
- [Commits](https://github.com/opensearch-project/opensearch-go/compare/v4.6.0...v4.7.3)

---
updated-dependencies:
- dependency-name: github.com/opensearch-project/opensearch-go/v4
  dependency-version: 4.7.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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