update ci gtk packge

Author: TeofilC

.github/workflows/ci.yml

@@ -52,7 +52,7 @@ jobs:
 
       - name: Install system dependencies (Ubuntu)
         if: runner.os == 'Linux' && !startsWith(matrix.container, 'alpine')
-        run: sudo apt-get update && sudo apt-get install libgtk3.0-dev
+        run: sudo apt-get update && sudo apt-get install libgtk-3-dev
 
       - name: Install system dependencies (macOS)
         if: runner.os == 'macOS'