CI: Update base branch to 3.6 #169

Job	Run time
📊 Static / Static Checks (clang-format, black format, file format, documentation checks)	3m 1s
🌐 JavaScript / Template (target=release, tools=no)	12m 36s
🤖 Android / Template (target=release, tools=no)	14m 57s
🐧 Linux / Editor w/ Mono (target=release_debug, tools=yes)	28m 26s
🐧 Linux / Editor and sanitizers (target=debug, tools=yes, use_asan=yes, use_ubsan=yes, linker=gold)	33m 18s
🍏 iOS / Template (target=release, tools=no)	4m 39s
🐧 Linux / Template w/ Mono (target=release, tools=no)	13m 56s
🐧 Linux / Minimal template (target=release, tools=no, everything disabled)	7m 40s
🍎 macOS / Editor (target=release_debug, tools=yes)	7m 45s
🍎 macOS / Template (target=release, tools=no)	4m 19s
☁ Server / Linux Headless w/ Mono (target=release_debug, tools=yes)	19m 0s
☁ Server / Linux Server w/ Mono (target=release, tools=no)	11m 40s
🏁 Windows / Editor (target=release_debug, tools=yes)	21m 12s
🏁 Windows / Template (target=release, tools=no)	12m 32s
	3h 15m 1s

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