Bump version to 3.6-rc #1

Job	Run time
📊 Static / Static Checks (clang-format, black format, file format, documentation checks)	2m 32s
🌐 JavaScript / Template (target=release, tools=no)	12m 50s
🐧 Linux / Editor w/ Mono (target=release_debug, tools=yes)	26m 54s
🤖 Android / Template (target=release, tools=no)	14m 28s
🍏 iOS / Template (target=release, tools=no)	4m 49s
🐧 Linux / Editor and sanitizers (target=debug, tools=yes, use_asan=yes, use_ubsan=yes, linker=gold)	32m 37s
🐧 Linux / Template w/ Mono (target=release, tools=no)	12m 36s
🐧 Linux / Minimal template (target=release, tools=no, everything disabled)	8m 18s
🍎 macOS / Editor (target=release_debug, tools=yes)	7m 31s
☁ Server / Linux Headless w/ Mono (target=release_debug, tools=yes)	18m 51s
🏁 Windows / Editor (target=release_debug, tools=yes)	21m 53s
🍎 macOS / Template (target=release, tools=no)	4m 30s
☁ Server / Linux Server w/ Mono (target=release, tools=no)	11m 25s
🏁 Windows / Template (target=release, tools=no)	13m 41s
	3h 12m 55s

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