semaphore: use Go 1.9.4, update release upgrade test version

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

.semaphore.sh

@@ -2,7 +2,7 @@
 
 TEST_SUFFIX=$(date +%s | base64 | head -c 15)
 
-TEST_OPTS="RELEASE_TEST=y INTEGRATION=y PASSES='build unit release integration_e2e functional' MANUAL_VER=v3.3.0-rc.0"
+TEST_OPTS="RELEASE_TEST=y INTEGRATION=y PASSES='build unit release integration_e2e functional' MANUAL_VER=v3.3.0"
 if [ "$TEST_ARCH" == "386" ]; then
 	TEST_OPTS="GOARCH=386 PASSES='build unit integration_e2e'"
 fi
@@ -10,7 +10,7 @@ fi
 docker run \
 	--rm \
 	--volume=`pwd`:/go/src/github.com/coreos/etcd \
-	gcr.io/etcd-development/etcd-test:go1.9.3 \
+	gcr.io/etcd-development/etcd-test:go1.9.4 \
 	/bin/bash -c "${TEST_OPTS} ./test 2>&1 | tee test-${TEST_SUFFIX}.log"
 
 ! egrep "(--- FAIL:|panic: test timed out|appears to have leaked)" -B50 -A10 test-${TEST_SUFFIX}.log