build(deps): bump step-security/harden-runner (#1)

Bumps the github-actions group with 1 update: [step-security/harden-runner](https://github.com/step-security/harden-runner).


Updates `step-security/harden-runner` from 2.20.1 to 2.21.0
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@b09bb98...05e3151)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

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/docs.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: 'ubuntu-latest'
     steps:
       - name: 'Harden the runner (Audit all outbound calls)'
-        uses: 'step-security/harden-runner@b09bb98e06d4d774595224525879c09bc6e98c40' # v2.20.1
+        uses: 'step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c' # v2.21.0
         with:
           egress-policy: 'audit'
 
@@ -58,7 +58,7 @@ jobs:
       url: '${{ steps.deployment.outputs.page_url }}'
     steps:
       - name: 'Harden the runner (Audit all outbound calls)'
-        uses: 'step-security/harden-runner@b09bb98e06d4d774595224525879c09bc6e98c40' # v2.20.1
+        uses: 'step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c' # v2.21.0
         with:
           egress-policy: 'audit'