build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.8.0 (#1624)

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

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google-cloud-logging-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.7.7</version>
+    <version>1.8.0</version>
   </parent>
 
   <name>Google Cloud logging BOM</name>