revert: grpc version update (#248)

Author: frankyn

google-cloud-storage/pom.xml

@@ -126,13 +126,13 @@
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>grpc-google-cloud-kms-v1</artifactId>
-      <version>0.85.0</version>
+      <version>0.83.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.google.api.grpc</groupId>
       <artifactId>proto-google-cloud-kms-v1</artifactId>
-      <version>0.85.0</version>
+      <version>0.83.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>

pom.xml

@@ -103,7 +103,7 @@
       <dependency>
         <groupId>io.grpc</groupId>
         <artifactId>grpc-bom</artifactId>
-        <version>1.28.1</version>
+        <version>1.27.0</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>