Fix CI to use yarp 3.9 conda package until we remove ROS 1 support (#51)

.github/workflows/conda-ci.yml

@@ -32,7 +32,8 @@ jobs:
       run: |
         # Workaround for https://github.com/conda-incubator/setup-miniconda/issues/186
         conda config --remove channels defaults
-        conda install -c conda-forge -c robotology cmake compilers make ninja pkg-config qt-main yarp icub-main idyntree
+        # We pin yarp to 3.9.* until https://github.com/robotology/idyntree-yarp-tools/issues/50 is fixed
+        conda install -c conda-forge -c robotology cmake compilers make ninja pkg-config qt-main yarp==3.9.* icub-main idyntree
 
     # Additional dependencies useful only on Linux
     - name: Dependencies [Conda/Linux]
@@ -41,7 +42,7 @@ jobs:
       run: |
         # Additional dependencies only useful on Linux
         # See https://github.com/robotology/robotology-superbuild/issues/477
-        conda install expat-cos6-x86_64 libselinux-cos6-x86_64 libxau-cos6-x86_64 libxcb-cos6-x86_64 libxdamage-cos6-x86_64 libxext-cos6-x86_64 libxfixes-cos6-x86_64 libxxf86vm-cos6-x86_64 mesalib mesa-libgl-cos6-x86_64 mesa-libgl-devel-cos6-x86_64
+        conda install libgl-devel
 
     - name: Configure [Linux&macOS]
       if: contains(matrix.os, 'macos') || contains(matrix.os, 'ubuntu')