feat: replace graal version declarion with properties placeholder (#2120)

Author: mpeddada1

gax-java/pom.xml

@@ -142,7 +142,7 @@
       <dependency>
         <groupId>org.graalvm.sdk</groupId>
         <artifactId>graal-sdk</artifactId>
-        <version>22.3.2</version>
+        <version>${graal-sdk.version}</version>
       </dependency>
       <dependency>
         <groupId>com.google.http-client</groupId>