Do not allow '@' in :authority or host field value #823

Job	Run time
build-cross (x86_64-w64-mingw32)	57s
build (ubuntu-24.04, gcc, autotools)	1m 3s
build-windows (x86)	1m 25s
build-cross (i686-w64-mingw32)	1m 27s
build (ubuntu-24.04, gcc, cmake)	40s
build-windows (x64)	2m 55s
build (ubuntu-24.04, clang, autotools)	43s
build (ubuntu-24.04, clang, distcheck)	1m 12s
build (ubuntu-24.04, clang, cmake)	46s
build (macos-13, gcc, autotools)	1m 13s
build (macos-13, gcc, cmake)	1m 12s
build (macos-13, clang, autotools)	1m 19s
build (macos-13, clang, cmake)	1m 9s
build (macos-14, gcc, autotools)	42s
build (macos-14, gcc, cmake)	39s
build (macos-14, clang, autotools)	44s
build (macos-14, clang, cmake)	41s
release	0s
	18m 47s

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