deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v0.12.1 (#255)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://togithub.com/googleapis/java-shared-dependencies) | patch | `0.12.0` -> `0.12.1` |

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### Release Notes

<details>
<summary>googleapis/java-shared-dependencies</summary>

### [`v0.12.1`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;0121-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare0120v0121-2020-10-16)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v0.12.0...v0.12.1)

</details>

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Author: renovate-bot

java-storage-nio/pom.xml

@@ -79,7 +79,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.12.0</version>
+        <version>0.12.1</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>