deps: update dependency com.google.cloud:first-party-dependencies to v3.20.0 (#6321)

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Author: renovate-bot

libraries-bom/pom.xml

@@ -65,7 +65,7 @@
  <dependency>
  <groupId>com.google.cloud</groupId>
  <artifactId>first-party-dependencies</artifactId>
- <version>3.19.0</version>
+ <version>3.20.0</version>
  <type>pom</type>
  <scope>import</scope>
  </dependency>