chore(deps): update dependency com.google.cloud:google-cloud-bigqueryconnection to v2.5.5 (googleapis#786)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [com.google.cloud:google-cloud-bigqueryconnection](https://togithub.com/googleapis/java-bigqueryconnection) | `2.5.4` -> `2.5.6` | [![age](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection/2.5.6/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection/2.5.6/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection/2.5.6/compatibility-slim/2.5.4)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/maven/com.google.cloud:google-cloud-bigqueryconnection/2.5.6/confidence-slim/2.5.4)](https://docs.renovatebot.com/merge-confidence/) |

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java-bigqueryconnection/README.md

@@ -19,7 +19,7 @@ If you are using Maven, add this to your pom.xml file:
 <dependency>
   <groupId>com.google.cloud</groupId>
   <artifactId>google-cloud-bigqueryconnection</artifactId>
-  <version>2.5.4</version>
+  <version>2.5.5</version>
 </dependency>
 
 ```

java-bigqueryconnection/samples/install-without-bom/pom.xml

@@ -29,7 +29,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigqueryconnection</artifactId>
-      <version>2.5.4</version>
+      <version>2.5.5</version>
     </dependency>
     <!-- [END bigqueryconnection_install_without_bom] -->
 

java-bigqueryconnection/samples/snippets/pom.xml

@@ -40,7 +40,7 @@
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-bigqueryconnection</artifactId>
       <!-- TODO: REMOVE VERSION SPECIFIED BELOW WHEN THE CLIENT GOES GA-->
-      <version>2.5.4</version>
+      <version>2.5.5</version>
     </dependency>
 
     <dependency>