deps: update dependency com.google.cloud:google-cloud-conformance-tests to v0.0.13 (#411)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [com.google.cloud:google-cloud-conformance-tests](https://togithub.com/googleapis/java-shared-config) | patch | `0.0.12` -> `0.0.13` |

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Author: renovate-bot

google-cloud-firestore/pom.xml

@@ -142,7 +142,7 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>google-cloud-conformance-tests</artifactId>
-      <version>0.0.12</version>
+      <version>0.0.13</version>
       <scope>test</scope>
     </dependency>
     <dependency>

google-cloud-firestore/src/test/java/com/google/cloud/firestore/ConformanceTest.java

@@ -554,6 +554,9 @@ private Query applyClause(Query query, Clause clause) {
             case ">":
               query = query.whereGreaterThan(fieldPath, value);
               break;
+            case "!=":
+              query = query.whereNotEqualTo(fieldPath, value);
+              break;
             default:
               throw new UnsupportedOperationException();
           }