Update pom.xml

Author: blakeli0

java-spanner/google-cloud-spanner/pom.xml

@@ -191,7 +191,6 @@
     <dependency>
       <groupId>com.google.cloud</groupId>
       <artifactId>grpc-gcp</artifactId>
-      <version>1.9.0</version>
       <exclusions>
          <exclusion>
             <groupId>io.opentelemetry</groupId>
@@ -214,6 +213,7 @@
     <dependency>
       <groupId>io.grpc</groupId>
       <artifactId>grpc-core</artifactId>
+      <version>1.78.0</version>
     </dependency>
     <dependency>
       <groupId>io.grpc</groupId>