deps: import bigtable bom and update to 1.7.1 (#43)

Author: chingor13

pom.xml

@@ -210,33 +210,10 @@
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
-        <artifactId>google-cloud-bigtable</artifactId>
-        <version>1.6.0</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-google-cloud-bigtable-v2</artifactId>
-        <version>0.82.0</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>grpc-google-cloud-bigtable-v2</artifactId>
-        <version>0.82.0</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>proto-google-cloud-bigtable-admin-v2</artifactId>
-        <version>0.82.0</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.api.grpc</groupId>
-        <artifactId>grpc-google-cloud-bigtable-admin-v2</artifactId>
-        <version>0.82.0</version>
-      </dependency>
-      <dependency>
-        <groupId>com.google.cloud</groupId>
-        <artifactId>google-cloud-bigtable-emulator</artifactId>
-        <version>0.115.0</version>
+        <artifactId>google-cloud-bigtable-bom</artifactId>
+        <version>1.7.1</version>
+        <type>pom</type>
+        <scope>import</scope>
       </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>