build(deps): Bump step-security/harden-runner from 2.16.0 to 2.19.3

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 2.16.0 to 2.19.3.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@fa2e9d6...ab7a940)

---
updated-dependencies:
- dependency-name: step-security/harden-runner
  dependency-version: 2.19.3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/cibuild.yml

@@ -27,7 +27,7 @@ jobs:
       BUNDLE_PATH: vendor/bundle
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@fa2e9d605c4eeb9fcad4c99c224cee0c6c7f3594 # v2.16.0
+      uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs