chore(deps): update dependency com.google.cloud:google-cloud-firestore to v3.31.8 (#2177)

Author: renovate-bot

samples/install-without-bom/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-firestore</artifactId>
-      <version>3.31.7</version>
+      <version>3.31.8</version>
     </dependency>
     <!-- [END firestore_install_without_bom] -->
 

samples/snapshot/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-firestore</artifactId>
-      <version>3.31.7</version>
+      <version>3.31.8</version>
     </dependency>
 
     <dependency>