[godot] Build against latest 4.x only

.github/workflows/spine-godot-v4-all.yml

@@ -16,8 +16,6 @@ jobs:
           [
             {"tag": "4.5.1-stable", "version": "4.5.1.stable", "mono": false},
             {"tag": "4.5.1-stable", "version": "4.5.1.stable", "mono": true},
-            {"tag": "4.4.1-stable", "version": "4.4.1.stable", "mono": false},
-            {"tag": "4.4.1-stable", "version": "4.4.1.stable", "mono": true},
           ]
     uses: ./.github/workflows/spine-godot-v4.yml
     with: