build(deps): bump splunk/addonfactory-test-matrix-action (#217)

Bumps [splunk/addonfactory-test-matrix-action](https://github.com/splunk/addonfactory-test-matrix-action) from 1.8.19 to 1.8.20.
- [Release notes](https://github.com/splunk/addonfactory-test-matrix-action/releases)
- [Changelog](https://github.com/splunk/addonfactory-test-matrix-action/blob/main/.releaserc)
- [Commits](splunk/addonfactory-test-matrix-action@v1.8.19...v1.8.20)

---
updated-dependencies:
- dependency-name: splunk/addonfactory-test-matrix-action
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-test-release.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v3
       - name: matrix
         id: matrix
-        uses: splunk/addonfactory-test-matrix-action@v1.8.19
+        uses: splunk/addonfactory-test-matrix-action@v1.8.20
 
   fossa-scan:
     continue-on-error: true