Bump step-security/harden-runner from 1.4.1 to 1.4.2 (#1004)

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 1.4.1 to 1.4.2.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](9b0655f430...34cbc43f0b)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Alan Jowett <alanjo@microsoft.com>

.github/workflows/update-docs.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
 
     - name: Harden Runner
-      uses: step-security/harden-runner@9b0655f430fba8c7001d4e38f8d4306db5c6e0ab
+      uses: step-security/harden-runner@34cbc43f0b10c9dda284e663cf43c2ebaf83e956
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs