Bump actions/github-script from 5 to 7 (#16039)

* Bump actions/github-script from 5 to 7

Bumps [actions/github-script](https://github.com/actions/github-script) from 5 to 7.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v5...v7)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update changelog

Signed-off-by: dependabot[bot] <support@github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: dependabot[bot] <dependabot[bot]@users.noreply.github.com>
(cherry picked from commit b984b9f)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

.github/workflows/delete_backport_branch.yml

@@ -12,7 +12,7 @@ jobs:
     if: startsWith(github.event.pull_request.head.ref,'backport/')
     steps:
     - name: Delete merged branch
-      uses: actions/github-script@v5
+      uses: actions/github-script@v7
       with:
         script: |
           github.rest.git.deleteRef({

CHANGELOG.md

@@ -22,6 +22,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Bump `com.microsoft.azure:msal4j` from 1.17.0 to 1.17.1 ([#15945](https://github.com/opensearch-project/OpenSearch/pull/15945))
 - Bump `ch.qos.logback:logback-core` from 1.5.6 to 1.5.8 ([#15946](https://github.com/opensearch-project/OpenSearch/pull/15946))
 - Update protobuf from 3.25.4 to 3.25.5 ([#16011](https://github.com/opensearch-project/OpenSearch/pull/16011))
+- Bump `actions/github-script` from 5 to 7 ([#16039](https://github.com/opensearch-project/OpenSearch/pull/16039))
 
 ### Changed