deps: update kms.version to v0.88.4 (#830)

Author: renovate-bot

google-cloud-storage/pom.xml

@@ -16,7 +16,7 @@
   </parent>
   <properties>
     <site.installationModule>google-cloud-storage</site.installationModule>
-    <kms.version>0.88.3</kms.version>
+    <kms.version>0.88.4</kms.version>
   </properties>
   <dependencies>
     <dependency>