deps: update dependencies io.grpc:* to v1.56.0 (#2072)

Author: BenWhitehead

pom.xml

@@ -59,12 +59,25 @@
 
   <dependencyManagement>
     <dependencies>
+      <dependency>
+        <groupId>io.grpc</groupId>
+        <artifactId>grpc-bom</artifactId>
+        <version>1.56.0</version>
+        <type>pom</type>
+        <scope>import</scope>
+      </dependency>
       <dependency>
         <groupId>com.google.cloud</groupId>
         <artifactId>google-cloud-shared-dependencies</artifactId>
         <version>${google.cloud.shared-dependencies.version}</version>
         <type>pom</type>
         <scope>import</scope>
+        <exclusions>
+          <exclusion>
+            <groupId>io.grpc</groupId>
+            <artifactId>*</artifactId>
+          </exclusion>
+        </exclusions>
       </dependency>
 
       <dependency>