build: Update to header 1.3.294 #613

Job	Run time
codegen	25s
linux (gcc, g++, Debug, ubuntu-20.04, XCB)	1m 3s
linux (gcc, g++, Debug, ubuntu-22.04, XCB)	59s
android (armeabi-v7a)	40s
linux (gcc, g++, Release, ubuntu-20.04, XCB)	1m 11s
mac	16m 58s
android (arm64-v8a)	35s
linux (gcc, g++, Release, ubuntu-22.04, XCB)	1m 14s
windows (Win32, Debug, windows-latest)	1m 53s
linux (gcc, g++, Release, ubuntu-22.04, WAYLAND)	1m 2s
windows (Win32, Release, windows-latest)	1m 58s
chromium	1m 27s
linux (clang, clang++, Debug, ubuntu-20.04, XLIB)	1m 1s
windows (x64, Debug, windows-latest)	1m 52s
windows (x64, Release, windows-latest)	1m 36s
mingw	1m 39s
linux (clang, clang++, Release, ubuntu-22.04, DISPLAY)	1m 17s
tools_codegen	41s
	37m 31s

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