chore(deps): update dependency com.google.cloud:libraries-bom to v8 (#104)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:libraries-bom](https://togithub.com/GoogleCloudPlatform/cloud-opensource-java) | major | `7.0.1` -> `8.0.0` |

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servicedirectory/snippets/snippets/pom.xml

@@ -42,7 +42,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>libraries-bom</artifactId>
-        <version>7.0.1</version>
+        <version>8.0.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>