Bump step-security/harden-runner from 2.13.0 to 2.13.1

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.13.0 to 2.13.1.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@ec9f2d5...f4a75cf)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.13.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/main.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
       # Use harden-runner https://github.com/step-security/harden-runner
       # presented at OpenSSF Best Practices WG 2022-03-15
-      - uses: step-security/harden-runner@ec9f2d5744a09debf3a187a3f4f675c53b671911 # v2.13.0
+      - uses: step-security/harden-runner@f4a75cfd619ee5ce8d5b864b0d183aff3c69b55a # v2.13.1
         with:
           egress-policy: audit