Bump version to 4.3-stable \o/ #9

Job	Run time
📊 Static checks / Code style, file formatting, and docs	23s
🍏 iOS / Template (target=template_release)	9m 30s
🍎 macOS / Editor (target=editor, tests=yes)	25m 15s
🤖 Android / Editor (target=editor)	24m 3s
🐧 Linux / Editor w/ Mono (target=editor)	39m 56s
🍎 macOS / Template (target=template_release)	3m 1s
🤖 Android / Template arm32 (target=template_release, arch=arm32)	16m 15s
🐧 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)	44m 7s
🌐 Web / Template w/ threads (target=template_release, threads=yes)	25m 40s
🤖 Android / Template arm64 (target=template_release, arch=arm64)	16m 23s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	36m 51s
🌐 Web / Template w/o threads (target=template_release, threads=no)	7m 8s
🏁 Windows / Editor (target=editor, tests=yes)	47m 34s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	32m 21s
🏁 Windows / Template (target=template_release)	34m 22s
🐧 Linux / Template w/ Mono (target=template_release)	27m 43s
🐧 Linux / Minimal template (target=template_release, everything disabled)	2m 18s
🪲 Godot CPP / Build and test Godot CPP	7m 57s
	6h 40m 47s

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