Bump version to 4.3-dev #48

Job	Run time
📊 Static checks / Code style, file formatting, and docs	2m 26s
🤖 Android / Template (target=template_release)	4m 40s
🍏 iOS / Template (target=template_release)	3m 58s
🐧 Linux / Editor w/ Mono (target=editor)	10m 21s
🐧 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)	20m 30s
🌐 Web / Template (target=template_release)	1m 57s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	11m 39s
🍎 macOS / Editor (target=editor, tests=yes)	42m 4s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	10m 32s
🏁 Windows / Editor (target=editor, tests=yes)	14m 1s
🍎 macOS / Template (target=template_release)	30m 16s
🐧 Linux / Template w/ Mono (target=template_release)	2m 7s
🏁 Windows / Template (target=template_release)	7m 25s
🐧 Linux / Minimal template (target=template_release, everything disabled)	1m 27s
🪲 Godot CPP / Build and test Godot CPP	6m 48s
	2h 50m 11s

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