chore(deps): bump libraries-bom from 8.0.0 to 20.4.0 (#558)

* chore(deps): bump libraries-bom from 8.0.0 to 20.4.0

Bumps [libraries-bom](https://github.com/GoogleCloudPlatform/cloud-opensource-java) from 8.0.0 to 20.4.0.
- [Release notes](https://github.com/GoogleCloudPlatform/cloud-opensource-java/releases)
- [Changelog](https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/master/CHANGELOG.md)
- [Commits](https://github.com/GoogleCloudPlatform/cloud-opensource-java/commits)

Signed-off-by: dependabot[bot] <support@github.com>

* fix: Removed legacy Firestore API calls

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Hiranya Jayathilaka <hiranya911@gmail.com>

Author: dependabot[bot]

pom.xml

@@ -393,7 +393,7 @@
             <dependency>
                 <groupId>com.google.cloud</groupId>
                 <artifactId>libraries-bom</artifactId>
-                <version>8.0.0</version>
+                <version>20.4.0</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>

src/test/java/com/google/firebase/cloud/FirestoreClientTest.java

@@ -69,11 +69,9 @@ public void testFirestoreOptions() throws IOException {
         .build());
     Firestore firestore = FirestoreClient.getFirestore(app);
     assertEquals("explicit-project-id", firestore.getOptions().getProjectId());
-    assertTrue(firestore.getOptions().areTimestampsInSnapshotsEnabled());
 
     firestore = FirestoreClient.getFirestore();
     assertEquals("explicit-project-id", firestore.getOptions().getProjectId());
-    assertTrue(firestore.getOptions().areTimestampsInSnapshotsEnabled());
   }
 
   @Test
@@ -88,13 +86,11 @@ public void testFirestoreOptionsOverride() throws IOException {
         .build());
     Firestore firestore = FirestoreClient.getFirestore(app);
     assertEquals("explicit-project-id", firestore.getOptions().getProjectId());
-    assertTrue(firestore.getOptions().areTimestampsInSnapshotsEnabled());
     assertSame(ImplFirebaseTrampolines.getCredentials(app),
         firestore.getOptions().getCredentialsProvider().getCredentials());
 
     firestore = FirestoreClient.getFirestore();
     assertEquals("explicit-project-id", firestore.getOptions().getProjectId());
-    assertTrue(firestore.getOptions().areTimestampsInSnapshotsEnabled());
     assertSame(ImplFirebaseTrampolines.getCredentials(app),
         firestore.getOptions().getCredentialsProvider().getCredentials());
   }