chore(deps): bump step-security/harden-runner from 1.5.0 to 2.7.1 (#549)

Bumps [step-security/harden-runner](https://github.com/step-security/harden-runner) from 1.5.0 to 2.7.1.
- [Release notes](https://github.com/step-security/harden-runner/releases)
- [Commits](step-security/harden-runner@2e205a2...a4aa98b)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/presubmits.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@2e205a28d0e1da00c5f53b161f4067b052c61f34 # v1
+      uses: step-security/harden-runner@a4aa98b93cab29d9b1101a6143fb8bce00e2eac4 # v1
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
@@ -32,7 +32,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@2e205a28d0e1da00c5f53b161f4067b052c61f34 # v1
+      uses: step-security/harden-runner@a4aa98b93cab29d9b1101a6143fb8bce00e2eac4 # v1
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs
 
@@ -58,7 +58,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Harden Runner
-      uses: step-security/harden-runner@2e205a28d0e1da00c5f53b161f4067b052c61f34 # v1
+      uses: step-security/harden-runner@a4aa98b93cab29d9b1101a6143fb8bce00e2eac4 # v1
       with:
         egress-policy: audit # TODO: change to 'egress-policy: block' after couple of runs