deps: update dependency com.google.cloud:google-cloud-conformance-tes…

…ts to v0.0.8 (#123)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| com.google.cloud:google-cloud-conformance-tests | patch | `0.0.6` -> `0.0.8` |

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google-cloud-firestore/pom.xml

@@ -162,7 +162,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-conformance-tests</artifactId>
-      <version>0.0.6</version>
+      <version>0.0.8</version>
       <scope>test</scope>
     </dependency>
     <dependency>