deps: update dependency com.google.cloud:google-cloud-securitycenter-bom to v1.2.0 (#837)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-securitycenter-bom](https://github.com/googleapis/java-securitycenter) | minor | `1.1.0` -> `1.2.0` |

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### Release Notes

<details>
<summary>googleapis/java-securitycenter</summary>

### [`v1.2.0`](https://github.com/googleapis/java-securitycenter/blob/master/CHANGELOG.md#&#8203;120-httpswwwgithubcomgoogleapisjava-securitycentercomparev110v120-2020-08-10)

[Compare Source](https://github.com/googleapis/java-securitycenter/compare/v1.1.0...v1.2.0)

##### Features

-   **v1beta1:** migrate to gapic v2 - SourceName -> ResourceName ([#&#8203;203](https://github.com/googleapis/java-securitycenter/issues/203)) ([4a88b5a](https://github.com/googleapis/java-securitycenter/commit/4a88b5a1b415b60e87fd0c9c8e1725cd61176479))

##### Bug Fixes

-   migrate to grpc_service_config ([#&#8203;200](https://github.com/googleapis/java-securitycenter/issues/200)) ([7813a66](https://github.com/googleapis/java-securitycenter/commit/7813a6696e4cca71f53f6042c062ec19b2f63780))

##### Dependencies

-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.2 ([#&#8203;194](https://github.com/googleapis/java-securitycenter/issues/194)) ([b17809b](https://github.com/googleapis/java-securitycenter/commit/b17809bf2d595af90782dda81dc7bc90a8a61a24))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.3 ([#&#8203;198](https://github.com/googleapis/java-securitycenter/issues/198)) ([04158c2](https://github.com/googleapis/java-securitycenter/commit/04158c218955efcd85b1009cae71ac94884f85cb))
-   update dependency com.google.cloud:google-cloud-shared-dependencies to v0.8.6 ([#&#8203;208](https://github.com/googleapis/java-securitycenter/issues/208)) ([9cf4964](https://github.com/googleapis/java-securitycenter/commit/9cf4964cb09196694b21705abf0c794e45dc587d))

</details>

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Author: renovate-bot

pom.xml

@@ -505,7 +505,7 @@
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-securitycenter-bom</artifactId>
-        <version>1.1.0</version>
+        <version>1.2.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>