Update Scintilla to v5.3.8 & Lexilla to v5.2.8 #20

Job	Run time
build_windows_msys2 (Release, x86_64)	12m 47s
build_windows (Release, x64)	4m 5s
build_windows_msys2 (Release, i686)	8m 50s
build_windows_cmake (Release, x64, amd64)	8m 7s
build_windows (Release, Win32)	3m 40s
build_windows_msys2 (Debug, x86_64)	5m 22s
build_windows (Release, ARM64)	4m 14s
build_windows_msys2 (Debug, i686)	5m 21s
build_windows (Debug, x64)	6m 24s
build_windows (Debug, Win32)	4m 31s
build_windows (Debug, ARM64)	3m 28s
	1h 6m 49s

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