ci: increase conan timeout to 3 minutes for slow mirrors

GNU FTP mirrors can be extremely slow, causing CI failures when downloading
dependencies like libtool. Increasing CONAN_REQUEST_TIMEOUT from default
60s to 180s to handle these slow downloads.

.github/actions/xahau-ga-dependencies/action.yml

@@ -83,6 +83,8 @@ runs:
 
     - name: Install dependencies
       shell: bash
+      env:
+        CONAN_REQUEST_TIMEOUT: 180  # Increase timeout to 3 minutes for slow mirrors
       run: |
         # Create build directory
         mkdir -p ${{ inputs.build_dir }}