chore(deps): update dependency com.google.cloud.samples:shared-config…

…uration to v1.0.21 (#160)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud.samples:shared-configuration](com/google/cloud/samples/shared-configuration) | patch | `1.0.18` -> `1.0.21` |

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servicedirectory/snippets/pom.xml

@@ -18,7 +18,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.18</version>
+    <version>1.0.21</version>
   </parent>
 
   <properties>

servicedirectory/snippets/snippets/pom.xml

@@ -26,7 +26,7 @@
   <parent>
     <groupId>com.google.cloud.samples</groupId>
     <artifactId>shared-configuration</artifactId>
-    <version>1.0.18</version>
+    <version>1.0.21</version>
   </parent>
 
   <properties>