Bump version to 4.3-dev #20

Job	Run time
📊 Static checks / Code style, file formatting, and docs	3m 5s
🐧 Linux / Editor w/ Mono (target=editor)	11m 37s
🤖 Android / Template (target=template_release)	5m 38s
🍏 iOS / Template (target=template_release)	2m 48s
🐧 Linux / Editor with doubles and GCC sanitizers (target=editor, tests=yes, dev_build=yes, scu_build=yes, precision=double, use_asan=yes, use_ubsan=yes, linker=gold)	21m 29s
🍎 macOS / Editor (target=editor, tests=yes)	13m 48s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	12m 3s
🍎 macOS / Template (target=template_release)	4m 10s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	12m 9s
🌐 Web / Template (target=template_release)	3m 35s
🏁 Windows / Editor (target=editor, tests=yes)	15m 38s
🐧 Linux / Template w/ Mono (target=template_release)	2m 45s
🏁 Windows / Template (target=template_release)	12m 21s
🐧 Linux / Minimal template (target=template_release, everything disabled)	13m 49s
🪲 Godot CPP / Build and test Godot CPP	6m 52s
	2h 21m 47s

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