[test] skip installing cmake 3.10.3 (openthread#11040)

There is a standalone CMake version check, no need to use this version
in gcc specific build tests. This change should accelerate gcc build
check, as it takes 8.5 minutes to build cmake.

Author: bukepo

.github/workflows/build.yml

@@ -262,14 +262,6 @@ jobs:
         sudo apt-get --no-install-recommends install -y build-essential lib32z1 ninja-build gcc-arm-linux-gnueabihf g++-arm-linux-gnueabihf
         wget --tries 4 --no-check-certificate --quiet ${{ matrix.gcc_download_url }} -O gcc-arm
         tar xf gcc-arm
-        sudo apt-get remove cmake
-        sudo apt-get purge --auto-remove cmake
-        wget http://www.cmake.org/files/v3.10/cmake-3.10.3.tar.gz
-        tar xf cmake-3.10.3.tar.gz
-        cd cmake-3.10.3
-        ./configure
-        sudo make install
-        cmake --version | grep 3.10.3
     - name: Build
       env:
         GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"