fix(deps): update dependency junit:junit to v4.13.2 (#940)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [junit:junit](http://junit.org) ([source](https://togithub.com/junit-team/junit4)) | `4.13.1` -> `4.13.2` | [![age](https://badges.renovateapi.com/packages/maven/junit:junit/4.13.2/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/junit:junit/4.13.2/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/junit:junit/4.13.2/compatibility-slim/4.13.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/junit:junit/4.13.2/confidence-slim/4.13.1)](https://docs.renovatebot.com/merge-confidence/) |

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gapic-generator-java/pom.xml

@@ -300,7 +300,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
     </dependency>
 
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