fix:ci:linux correct gtk3 package name

Author: metalstrolch

.circleci/config.yml

@@ -32,7 +32,7 @@ jobs:
           name: Setup requirements
           command: |
             bash scripts/setup_common_requirements.sh
-            apt-get install -y libpng-dev libfreetype6-dev libdbus-glib-1-dev libgtk3-dev curl
+            apt-get install -y libpng-dev libfreetype6-dev libdbus-glib-1-dev libgtk-3-dev curl
       - run:
           name: Build for Linux
           command: bash scripts/build_linux.sh