Merge pull request lagadic#1520 from olivier-roussel/update_conda_ci_xorg

Add xorg-xorgproto dep on linux

Author: fspindle

.github/workflows/conda/environment_linux.yml

@@ -7,6 +7,7 @@ dependencies:
   - ninja
   - xorg-libx11
   - xorg-libxfixes
+  - xorg-xorgproto
   - mesa-libegl-cos7-x86_64
   - icu
   - libxml2