deps: update dependency com.google.api:api-common to v2.0.4 (#585)

Author: renovate-bot

java-core/pom.xml

@@ -152,7 +152,7 @@
     <github.global.server>github</github.global.server>
     <site.installationModule>google-cloud-core-parent</site.installationModule>
     <gax.version>2.5.0</gax.version>
-    <google.api-common.version>2.0.2</google.api-common.version>
+    <google.api-common.version>2.0.4</google.api-common.version>
     <google.common-protos.version>2.5.0</google.common-protos.version>
     <google.iam.version>1.1.4</google.iam.version>
     <google.auth.version>1.2.0</google.auth.version>