meta: bump step-security/harden-runner from 2.2.1 to 2.3.1

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.2.1 to 2.3.1.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@1f99358...6b3083a)

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

Signed-off-by: dependabot[bot] <support@github.com>
PR-URL: #47808
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Mestery <mestery@protonmail.com>

.github/workflows/scorecard.yml

@@ -33,7 +33,7 @@ jobs:
 
     steps:
       - name: Harden Runner
-        uses: step-security/harden-runner@1f99358870fe1c846a3ccba386cc2b2246836776  # v2.2.1
+        uses: step-security/harden-runner@6b3083af2869dc3314a0257a42f4af696cc79ba3  # v2.3.1
         with:
           egress-policy: audit  # TODO: change to 'egress-policy: block' after couple of runs