build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.5.1 (#765)

* build(deps): update dependency com.google.cloud:google-cloud-shared-config to v1.5.1

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java-cloudbuild/google-cloud-build-bom/pom.xml

@@ -8,7 +8,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.5.0</version>
+    <version>1.5.1</version>
   </parent>
 
   <name>Google Cloud Build BOM</name>

java-cloudbuild/pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>1.5.0</version>
+    <version>1.5.1</version>
   </parent>
 
   <developers>