build(deps): bump shimataro/ssh-key-action from 2.5.1 to 2.6.1

Bumps [shimataro/ssh-key-action](https://github.com/shimataro/ssh-key-action) from 2.5.1 to 2.6.1.
- [Release notes](https://github.com/shimataro/ssh-key-action/releases)
- [Changelog](https://github.com/shimataro/ssh-key-action/blob/v2/CHANGELOG.md)
- [Commits](shimataro/ssh-key-action@v2.5.1...v2.6.1)

---
updated-dependencies:
- dependency-name: shimataro/ssh-key-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/sub-deploy-integration-tests-gcp.yml

@@ -138,7 +138,7 @@ jobs:
 
       # Install our SSH secret
       - name: Install private SSH key
-        uses: shimataro/ssh-key-action@v2.5.1
+        uses: shimataro/ssh-key-action@v2.6.1
         with:
           key: ${{ secrets.GCP_SSH_PRIVATE_KEY }}
           name: google_compute_engine
@@ -268,7 +268,7 @@ jobs:
 
       # Install our SSH secret
       - name: Install private SSH key
-        uses: shimataro/ssh-key-action@v2.5.1
+        uses: shimataro/ssh-key-action@v2.6.1
         with:
           key: ${{ secrets.GCP_SSH_PRIVATE_KEY }}
           name: google_compute_engine
@@ -564,7 +564,7 @@ jobs:
 
       # Install our SSH secret
       - name: Install private SSH key
-        uses: shimataro/ssh-key-action@v2.5.1
+        uses: shimataro/ssh-key-action@v2.6.1
         with:
           key: ${{ secrets.GCP_SSH_PRIVATE_KEY }}
           name: google_compute_engine
@@ -711,7 +711,7 @@ jobs:
 
       # Install our SSH secret
       - name: Install private SSH key
-        uses: shimataro/ssh-key-action@v2.5.1
+        uses: shimataro/ssh-key-action@v2.6.1
         with:
           key: ${{ secrets.GCP_SSH_PRIVATE_KEY }}
           name: google_compute_engine