godot-upgrade: 4.0 RC 1 -> RC 2

[f8122dac91]

Godot 4.0 RC 2 changelog:

• current: https://godotengine.org/article/release-candidate-godot-4-0-rc-1/
• next: https://godotengine.org/article/release-candidate-godot-4-0-rc-2/

Notable changes:

• 2D: Fix random placement behavior in TileMap editor (GH-61411).
• 2D: Fix TileMap patterns creation (GH-73034).
• 2D: Fix camera reparenting (GH-73063).
• GUI: Cleanup Window callbacks before destroying in to avoid callback calls with invalid object (GH-73239).
• Rendering: OpenGL: Store blend mode between CanvasItems to preserve batching (GH-73255).
• Import: Fix SceneImportSettings performance issues (GH-71691).

CI Docker Image:

• f8122dac91/godot-4.0-ci-exporter:rc2