Fix Go Flink VR conf path

Author: Abacn

.github/trigger_files/beam_PostCommit_Go_VR_Flink.json

@@ -1,6 +1,6 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 2,
+  "modification": 3,
   "https://github.com/apache/beam/pull/32440": "testing datastream optimizations",
   "pr": "37640"
 }

sdks/go/test/build.gradle

@@ -92,7 +92,7 @@ task flinkValidatesRunner {
   doFirst {
     // Copy Flink conf file
     copy {
-      from "${project.rootDir}/runners/flink/${flinkVersion}/src/test/resources/flink-test-config.yaml"
+      from "${project.rootDir}/runners/flink/2.0/src/test/resources/flink-test-config.yaml"
       into "${project.buildDir}/flink-conf"
 
       // Rename the file during the copy process