deps: update dependency com.google.cloud:google-cloud-shared-dependen…

…cies to v0.18.0 (#592)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-dependencies](https://github.com/googleapis/java-shared-dependencies) | minor | `0.17.1` -> `0.18.0` |

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### Release Notes

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

### [`v0.18.0`](https://github.com/googleapis/java-shared-dependencies/blob/master/CHANGELOG.md#&#8203;0180-httpswwwgithubcomgoogleapisjava-shared-dependenciescompare0171v0180-2021-01-13)

[Compare Source](https://github.com/googleapis/java-shared-dependencies/compare/v0.17.1...v0.18.0)

##### Features

-   add commons-codec to dependencyManagement ([#&#8203;251](https://www.github.com/googleapis/java-shared-dependencies/issues/251)) ([4ee990d](https://www.github.com/googleapis/java-shared-dependencies/commit/4ee990d79c9207c81155f6ee9279308a2d4d0f9d))

##### Dependencies

-   update dependency com.google.errorprone:error_prone_annotations to v2.5.0 ([#&#8203;247](https://www.github.com/googleapis/java-shared-dependencies/issues/247)) ([37c0861](https://www.github.com/googleapis/java-shared-dependencies/commit/37c0861cfb89f13a0682c98067c633b13b30b827))

##### [0.17.1](https://www.github.com/googleapis/java-shared-dependencies/compare/0.17.0...v0.17.1) (2021-01-12)

##### Dependencies

-   update dependency com.fasterxml.jackson:jackson-bom to v2.12.1 ([#&#8203;245](https://www.github.com/googleapis/java-shared-dependencies/issues/245)) ([5ffc8a0](https://www.github.com/googleapis/java-shared-dependencies/commit/5ffc8a0d173ea0222ac9610ece0ac2aeb1d17f27))

</details>

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google-cloud-bigtable-deps-bom/pom.xml

@@ -79,7 +79,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
-        <version>0.17.1</version>
+        <version>0.18.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>