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ci[windows]: revert to windows 2019 builder to try to fix Xerces C #853

Job	Run time
🍏 macOS (Clang - Debug)	38s
🍏 macOS (Clang, no validation - Release)	47s
🍏 macOS (Clang, Shared - Release)	51s
🐧 Linux (GCC - Debug)	30s
🐧 Linux (GCC, extra validation - Release)	1m 56s
🐧 Linux (GCC, Shared - Release)	1m 37s
🪟 Windows (MSVC - Debug)	4m 19s
🪟 Windows (MSVC [32-bit] - Debug)	4m 45s
🪟 Windows (MSVC - Release)	4m 0s
🪟 Windows (MSVC, Shared - Release)	5m 18s
	24m 41s

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