deps: update dependency com.google.cloud:first-party-dependencies to v3.56.0 (#7351)

Co-authored-by: Jin Seop Kim <jinseop@google.com>

Author: renovate-bot

libraries-bom/pom.xml

@@ -44,7 +44,7 @@
 
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <first-party-dependencies.version>3.55.1</first-party-dependencies.version>
+    <first-party-dependencies.version>3.56.0</first-party-dependencies.version>
   </properties>
 
   <distributionManagement>