CI: Remove now unused sources.list file #27

Job	Run time
📊 Static / Static Checks (clang-format, black format, file format, documentation checks)	3m 13s
🤖 Android / Template (target=release, tools=no)	15m 13s
🌐 JavaScript / Template (target=release, tools=no)	13m 5s
🐧 Linux / Editor w/ Mono (target=release_debug, tools=yes)	24m 21s
🍏 iOS / Template (target=release, tools=no)	5m 9s
🐧 Linux / Editor and sanitizers (target=debug, tools=yes, use_asan=yes, use_ubsan=yes, linker=gold)	28m 43s
🍎 macOS / Editor (target=release_debug, tools=yes)	8m 29s
☁ Server / Linux Headless w/ Mono (target=release_debug, tools=yes)	16m 33s
🍎 macOS / Template (target=release, tools=no)	5m 59s
🐧 Linux / Template w/ Mono (target=release, tools=no)	11m 34s
☁ Server / Linux Server w/ Mono (target=release, tools=no)	10m 9s
🏁 Windows / Editor (target=release_debug, tools=yes)	21m 14s
🐧 Linux / Minimal template (target=release, tools=no, everything disabled)	6m 38s
🏁 Windows / Template (target=release, tools=no)	13m 40s
	3h 4m 0s

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