chore(deps): update dependency com.google.cloud:google-cloud-os-config to v2.5.5 (#554)

[![Mend Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-os-config](https://togithub.com/googleapis/java-os-config) | `2.5.4` -> `2.5.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/2.5.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/2.5.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/2.5.6/compatibility-slim/2.5.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-os-config/2.5.6/confidence-slim/2.5.4)](https://docs.renovatebot.com/merge-confidence/) |

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

♻ **Rebasing**: Renovate will not automatically rebase this PR, because other commits have been found.

🔕 **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, click this checkbox. ⚠ **Warning**: custom changes will be lost.

---

This PR has been generated by [Mend Renovate](https://www.mend.io/free-developer-tools/renovate/). View repository job log [here](https://app.renovatebot.com/dashboard#github/googleapis/java-os-config).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzMi4yMTcuMCIsInVwZGF0ZWRJblZlciI6IjMyLjIxNy4wIn0=-->

Author: renovate-bot

java-os-config/samples/snippets/pom.xml

@@ -28,7 +28,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-os-config</artifactId>
-      <version>2.5.4</version>
+      <version>2.5.5</version>
     </dependency>
     <!-- [END os_config_install_without_bom] -->