Update web deploy CI to use Godot 3.3

.github/workflows/export_html5.yml

@@ -5,14 +5,14 @@ on:
       - master
 
 env:
-  GODOT_VERSION: 3.2.3
+  GODOT_VERSION: 3.3
 
 jobs:
   export-html5:
     name: Export projects to HTML5 and deploy to GitHub Pages
     runs-on: ubuntu-20.04
     container:
-      image: barichello/godot-ci:3.2.3
+      image: barichello/godot-ci:3.3
     steps:
       - name: Checkout
         uses: actions/checkout@v2.3.4

misc/os_test/os_test.gd

@@ -95,6 +95,7 @@ func _ready():
 	][OS.screen_orientation])
 
 	add_header("Engine")
+	add_line("Version", Engine.get_version_info()["string"])
 	add_line("Command-line arguments", str(OS.get_cmdline_args()))
 	add_line("Is debug build", OS.is_debug_build())
 	add_line("Executable path", OS.get_executable_path())