chore(deps): update dependency com.google.cloud.samples:shared-configuration to v1.0.15 (#29)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud.samples:shared-configuration](https://togithub.com/GoogleCloudPlatform/java-repo-tools) | patch | `1.0.14` -> `1.0.15` |

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### Release Notes

<details>
<summary>GoogleCloudPlatform/java-repo-tools</summary>

### [`v1.0.15`](https://togithub.com/GoogleCloudPlatform/java-repo-tools/releases/v1.0.15)

[Compare Source](https://togithub.com/GoogleCloudPlatform/java-repo-tools/compare/v1.0.14...v1.0.15)

-   Move some stuff around (in prep for a change to release process) pom.xml's
-   Add an exclude filter for SpotBugs. (disable the Java 11 surprise)
-   Don't fail on SpotBugs issues for now
-   add PMD reporting
-   Don't fail on PMD issues for now.

</details>

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servicedirectory/snippets/snippets/pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.14</version>
+    <version>1.0.15</version>
   </parent>
 
   <properties>