Bump @google-cloud/secret-manager from 5.0.1 to 5.6.0

Bumps [@google-cloud/secret-manager](https://github.com/googleapis/google-cloud-node/tree/HEAD/packages/google-cloud-secretmanager) from 5.0.1 to 5.6.0.
- [Release notes](https://github.com/googleapis/google-cloud-node/releases)
- [Changelog](https://github.com/googleapis/google-cloud-node/blob/main/packages/google-cloud-secretmanager/CHANGELOG.md)
- [Commits](https://github.com/googleapis/google-cloud-node/commits/dlp-v5.6.0/packages/google-cloud-secretmanager)

---
updated-dependencies:
- dependency-name: "@google-cloud/secret-manager"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -18,7 +18,7 @@
   },
   "dependencies": {
     "@google-cloud/logging-bunyan": "^5.0.1",
-    "@google-cloud/secret-manager": "^5.0.1",
+    "@google-cloud/secret-manager": "^5.6.0",
     "bl": "^6.0.12",
     "bunyan": "^1.8.15",
     "express": "^4.18.2",