build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.8.0 (#303)

Author: renovate-bot

pom.xml

@@ -15,7 +15,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.5.5</version>
+    <version>1.8.0</version>
   </parent>
 
   <properties>