C#: Upgrade TFM for `net472` and some `netstandard2.0` projects #491

Job	Run time
📊 Static checks / Code style, file formatting, and docs	3m 8s
🍏 iOS / Template (target=template_release)	28m 29s
🤖 Android / Template (target=template_release)	27m 38s
🍎 macOS / Editor (target=editor, tests=yes)	22m 48s
🐧 Linux / Editor w/ Mono (target=editor)	33m 20s
🍎 macOS / Template (target=template_release)	14m 43s
🐧 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)	37m 29s
🌐 Web / Template (target=template_release)	19m 56s
🏁 Windows / Editor (target=editor, tests=yes)	41m 27s
🐧 Linux / Editor with clang sanitizers (target=editor, tests=yes, dev_build=yes, use_asan=yes, use_ubsan=yes, use_llvm=yes, linker=lld)	29m 51s
🏁 Windows / Template (target=template_release)	29m 1s
🐧 Linux / Editor with ThreadSanitizer (target=editor, tests=yes, dev_build=yes, use_tsan=yes, use_llvm=yes, linker=lld)	26m 2s
🐧 Linux / Template w/ Mono (target=template_release)	23m 15s
🐧 Linux / Minimal template (target=template_release, everything disabled)	14m 43s
🪲 Godot CPP / Build and test Godot CPP	6m 38s
	5h 58m 28s

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