CI: Update Godot binary to 3.4-stable for tests

.github/workflows/ci.yml

@@ -21,8 +21,8 @@ jobs:
           sudo apt-get update -qq
           sudo apt-get install -qqq build-essential pkg-config
           python -m pip install scons
-          curl -LO https://downloads.tuxfamily.org/godotengine/3.3.3/Godot_v3.3.3-stable_linux_server.64.zip
-          unzip Godot_v3.3.3-stable_linux_server.64.zip
+          curl -LO https://downloads.tuxfamily.org/godotengine/3.4/Godot_v3.4-stable_linux_server.64.zip
+          unzip Godot_v3.4-stable_linux_server.64.zip
 
       - name: Build godot-cpp
         run: |
@@ -41,7 +41,7 @@ jobs:
 
       - name: Run test GDNative library
         run: |
-          ./Godot_v3.3.3-stable_linux_server.64 --path test -s script.gd
+          ./Godot_v3.4-stable_linux_server.64 --path test -s script.gd
 
   windows-msvc:
     name: Build (Windows, MSVC)
@@ -123,8 +123,8 @@ jobs:
       - name: Install dependencies
         run: |
           python -m pip install scons
-          curl -LO https://downloads.tuxfamily.org/godotengine/3.3.3/Godot_v3.3.3-stable_osx.universal.zip
-          unzip Godot_v3.3.3-stable_osx.universal.zip
+          curl -LO https://downloads.tuxfamily.org/godotengine/3.4/Godot_v3.4-stable_osx.universal.zip
+          unzip Godot_v3.4-stable_osx.universal.zip
 
       - name: Build godot-cpp
         run: |