feat: remove dependency management of graal-sdk (#4033)

Author: mpeddada1

sdk-platform-java/gax-java/pom.xml

@@ -129,11 +129,6 @@
         <artifactId>gson</artifactId>
         <version>${gson.version}</version>
       </dependency>
-      <dependency>
-        <groupId>org.graalvm.sdk</groupId>
-        <artifactId>graal-sdk</artifactId>
-        <version>${graal-sdk.version}</version>
-      </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>