Use CMake 3.23 until ament/ament_cmake#395 is sorted out

.github/workflows/main.yml

@@ -6,7 +6,12 @@ jobs:
     runs-on: macos-latest
     steps:
       - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
+      - name: Setup cmake
+        uses: jwlawson/[email protected]
+        with:
+          cmake-version: '3.23.x'
+      - name: Setup Python
+        uses: actions/setup-python@v4
         with:
           python-version: '3.10'
           cache: 'pip'

README.md

@@ -64,6 +64,8 @@ Guides: https://docs.ros.org/en/humble/Installation/Alternatives/macOS-Developme
     Also need to comment out the relevant code in the source code `TypeSupport_Impl.cpp` of `rmw_fastrtps_shared_cpp`.
     See https://github.com/ros2/ros2/issues/468 and https://github.com/ros2/ros2/issues/306 and https://github.com/ros2/rosidl_typesupport/pull/10 .
 
+    Other relevant pages are https://docs.ros.org/en/humble/How-To-Guides/Working-with-multiple-RMW-implementations.html and https://docs.ros.org/en/humble/Concepts/About-Different-Middleware-Vendors.html and https://docs.ros.org/en/humble/Installation/DDS-Implementations.html
+
 According to `find src -maxdepth 2`, my final `src` directory contains:
 ```
 src