build(deps): update dependency com.google.cloud:google-cloud-shared-c…

…onfig to v0.9.3 (#808)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-shared-config](https://togithub.com/googleapis/java-shared-config) | patch | `0.9.2` -> `0.9.3` |

---

### Release Notes

<details>
<summary>googleapis/java-shared-config</summary>

### [`v0.9.3`](https://togithub.com/googleapis/java-shared-config/blob/master/CHANGELOG.md#&#8203;093-httpswwwgithubcomgoogleapisjava-shared-configcomparev092v093-2020-10-15)

[Compare Source](https://togithub.com/googleapis/java-shared-config/compare/v0.9.2...v0.9.3)

</details>

---

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google-cloud-bigquery/pom.xml

@@ -82,6 +82,12 @@
       <artifactId>threetenbp</artifactId>
     </dependency>
 
+    <!-- auto-value creates a class that uses an annotation from error_prone_annotations -->
+    <dependency>
+      <groupId>com.google.errorprone</groupId>
+      <artifactId>error_prone_annotations</artifactId>
+    </dependency>
+
     <!-- Test dependencies -->
     <dependency>
       <groupId>junit</groupId>

pom.xml

@@ -14,7 +14,7 @@
   <parent>
     <groupId>com.google.cloud</groupId>
     <artifactId>google-cloud-shared-config</artifactId>
-    <version>0.9.2</version>
+    <version>0.9.3</version>
   </parent>
 
   <developers>
@@ -124,17 +124,6 @@
     </dependencies>
   </dependencyManagement>
 
-  <build>
-    <pluginManagement>
-      <plugins>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-dependency-plugin</artifactId>
-        </plugin>
-      </plugins>
-    </pluginManagement>
-  </build>
-
   <modules>
     <module>google-cloud-bigquery</module>
   </modules>