deps: update dependency com.google.cloud:google-cloud-shared-dependencies to v0.15.0 (#256)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://togithub.com/googleapis/java-shared-dependencies) | minor | `0.14.1` -> `0.15.0` |

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### Release Notes

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

### [`v0.15.0`](https://togithub.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;0150-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare0141v0150-2020-11-10)

[Compare Source](https://togithub.com/googleapis/java-shared-dependencies/compare/v0.14.1...v0.15.0)

##### Dependencies

-   update dependency com.google.http-client:google-http-client-bom to v1.38.0 ([#&#8203;207](https://www.github.com/googleapis/java-shared-dependencies/issues/207)) ([5e3198d](https://www.github.com/googleapis/java-shared-dependencies/commit/5e3198de5e1d0fe55c4d947b12984db7726059da))
-   update google.common-protos.version to v2.0.1 ([#&#8203;205](https://www.github.com/googleapis/java-shared-dependencies/issues/205)) ([6b12417](https://www.github.com/googleapis/java-shared-dependencies/commit/6b1241737d34e99a55acdcd439aa71ad28d1e26c))
-   update iam.version to v1.0.3 ([#&#8203;206](https://www.github.com/googleapis/java-shared-dependencies/issues/206)) ([94a4e31](https://www.github.com/googleapis/java-shared-dependencies/commit/94a4e31634718a206ef0f5ff1a8801dc7be4c5c5))

##### [0.14.1](https://www.github.com/googleapis/java-shared-dependencies/compare/0.14.0...v0.14.1) (2020-10-31)

##### Dependencies

-   update google.core.version to v1.93.10 ([#&#8203;200](https://www.github.com/googleapis/java-shared-dependencies/issues/200)) ([2d73dc1](https://www.github.com/googleapis/java-shared-dependencies/commit/2d73dc152469d175c74f85c5c76dcc67993c9783))

</details>

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pom.xml

@@ -70,7 +70,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.14.1</version>
+        <version>0.15.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>