godot-upgrade: 4.0 RC 3 -> RC 6

[f8122dac91]

4.0 Development Progress

As of Feb 28, the godot 4.0 milestone on the github repo is at 100% completion with 21,968 4.0 issues all marked as closed:

Changelog:

• current: https://godotengine.org/article/release-candidate-godot-4-0-rc-3/
• skipped:
  • https://godotengine.org/article/release-candidate-godot-4-0-rc-4/
  • https://godotengine.org/article/release-candidate-godot-4-0-rc-5/
• next: https://godotengine.org/article/release-candidate-godot-4-0-rc-6/

Notable changes:

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CI Docker Image:

• f8122dac91/godot-4.0-ci-exporter:rc6