chore(deps): update dependency com.google.cloud:google-cloud-security-private-ca to v2.3.1 (#404)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-security-private-ca](https://togithub.com/googleapis/java-) | `2.3.0` -> `2.3.1` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-security-private-ca/2.3.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-security-private-ca/2.3.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-security-private-ca/2.3.1/compatibility-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-security-private-ca/2.3.1/confidence-slim/2.3.0)](https://docs.renovatebot.com/merge-confidence/) |

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Author: renovate-bot

privateca/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-security-private-ca</artifactId>
-      <version>2.3.0</version>
+      <version>2.3.1</version>
     </dependency>
     <dependency>
       <groupId>org.bouncycastle</groupId>