prow.sh: use 1.3.0 hostpath driver for testing

The final 1.3.0 release of the hostpath driver really uses the 1.3.0
driver image in its deployment, in contrast to the previous -rc
candidates which still used 1.2.0.

prow.sh

@@ -193,7 +193,7 @@ configvar CSI_PROW_WORK "$(mkdir -p "$GOPATH/pkg" && mktemp -d "$GOPATH/pkg/csip
 # If the deployment script is called with CSI_PROW_TEST_DRIVER=<file name> as
 # environment variable, then it must write a suitable test driver configuration
 # into that file in addition to installing the driver.
-configvar CSI_PROW_DRIVER_VERSION "v1.3.0-rc4" "CSI driver version"
+configvar CSI_PROW_DRIVER_VERSION "v1.3.0" "CSI driver version"
 configvar CSI_PROW_DRIVER_REPO https://github.com/kubernetes-csi/csi-driver-host-path "CSI driver repo"
 configvar CSI_PROW_DEPLOYMENT "" "deployment"