instal protobuf==3.18.0, same fix as jsk-ros-pkg/jsk_travis#449

```
https://files.pythonhosted.org/packages/6c/be/4e32d02bf08b8f76bf6e59f2a531690c1e4264530404501f3489ca975d9a/protobuf-4.21.0-py2.py3-none-any.whl (164kB)
2022-06-07T23:44:05.9270037Z protobuf requires Python '>=3.7' but the running Python is 2.7.17
2022-06-07T23:44:05.9270288Z You are using pip version 9.0.3, however version 22.1.2 is available.
2022-06-07T23:44:05.9270590Z You should consider upgrading via the 'pip install --upgrade pip' command.
```

Author: k-okada

.github/workflows/config.yml

@@ -21,21 +21,21 @@ jobs:
             NOT_TEST_INSTALL : true
             USE_JENKINS: true
             DOCKER_IMAGE_JENKINS: ros-ubuntu:14.04-pcl
-            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 cupy-cuda91; sudo pip install requests[socks]==2.25.1"
+            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 protobuf==3.18.0 cupy-cuda91; sudo pip install requests[socks]==2.25.1"
             experimental : false
           - ROS_DISTRO: kinetic
             USE_DEB: true
             NOT_TEST_INSTALL : true
             USE_JENKINS: true
             DOCKER_IMAGE_JENKINS: ros-ubuntu:16.04-pcl
-            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 cupy-cuda91;"
+            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 protobuf==3.18.0 cupy-cuda91;"
             experimental : false
           - ROS_DISTRO: melodic
             USE_DEB: true
             NOT_TEST_INSTALL : true
             USE_JENKINS: true
             DOCKER_IMAGE_JENKINS: ros-ubuntu:18.04-pcl
-            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 cupy-cuda91;"
+            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 protobuf==3.18.0 cupy-cuda91;"
             experimental : false
           - ROS_DISTRO: melodic
             USE_DEB: true
@@ -52,14 +52,14 @@ jobs:
             USE_JENKINS: true
             DOCKER_IMAGE_JENKINS: ros-ubuntu:20.04-pcl
             TEST_PKGS : 'jsk_recognition_msgs' # to skip test
-            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 cupy-cuda91;"
+            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 protobuf==3.18.0 cupy-cuda91;"
             experimental : false
           - ROS_DISTRO: noetic
             USE_DEB: false
             NOT_TEST_INSTALL : true
             USE_JENKINS: true
             DOCKER_IMAGE_JENKINS: ros-ubuntu:20.04-pcl
-            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 cupy-cuda91;"
+            BEFORE_SCRIPT : "sudo pip install numpy==1.16.6; sudo pip install fcn chainercv chainer-mask-rcnn==0.3.0 decorator==4.4.2 chainer==6.7.0 protobuf==3.18.0 cupy-cuda91;"
             experimental : true