actions(deps): bump phoenix-actions/test-reporting from 14 to 15

Bumps [phoenix-actions/test-reporting](https://github.com/phoenix-actions/test-reporting) from 14 to 15.
- [Release notes](https://github.com/phoenix-actions/test-reporting/releases)
- [Changelog](https://github.com/phoenix-actions/test-reporting/blob/main/CHANGELOG.md)
- [Commits](phoenix-actions/test-reporting@v14...v15)

---
updated-dependencies:
- dependency-name: phoenix-actions/test-reporting
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/terraform-tests.yaml

@@ -142,7 +142,7 @@ jobs:
 
       - name: Publish the TerraTest summary
         id: junit-summary
-        uses: phoenix-actions/test-reporting@v14
+        uses: phoenix-actions/test-reporting@v15
         if: always()
         with:
           name: TerraTest Summary
@@ -153,7 +153,7 @@ jobs:
 
       - name: Publish the TerraTest results
         id: junit-report
-        uses: phoenix-actions/test-reporting@v14
+        uses: phoenix-actions/test-reporting@v15
         if: always()
         with:
           name: Terraform CI / Testing / TerraTest Results