fix script

Author: mpeddada1

.kokoro/build.sh

@@ -73,13 +73,13 @@ integration)
 graalvmA)
     # Run Unit and Integration Tests with Native Image
     echo "HELLOOOO"
-    $(dirname $0)/populate-secrets.sh
+    bash .kokoro/populate-secrets.sh
     mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Pnative-test test -pl 'oauth2_http'
     RETURN_CODE=$?
     ;;
 graalvmB)
     # Run Unit and Integration Tests with Native Image
-    $(dirname $0)/populate-secrets.sh
+    bash .kokoro/populate-secrets.sh
     mvn -B ${INTEGRATION_TEST_ARGS} -ntp -Pnative -Pnative-test test -pl 'oauth2_http'
     RETURN_CODE=$?
     ;;