build(deps): bump filelock from 3.20.0 to 3.20.3 in /tests/http #4

Job	Run time
msvc, CM x64-uwp !ssl +examples	2m 27s
dl-mingw, CM 15.1.0-x86_64 schannel	2m 50s
linux-mingw, CM clang-tidy	4m 55s
cygwin, CM x86_64 openssl	6m 57s
dl-mingw, CM 6.4.0-i686 schannel !unity	1m 43s
msvc, CM arm64-windows schannel U	9m 0s
dl-mingw, CM 7.3.0-x86_64 schannel mbedtls U	2m 18s
linux-mingw, AM gcc	2m 16s
linux-mingw, CM gcc	1m 6s
msvc, CM x64-windows openssl +examples	6m 3s
cygwin, AM x86_64 openssl R	8m 12s
dl-mingw, CM 9.5.0-x86_64 schannel	7m 0s
dl-mingw, CM 4.8.1-x86_64 schannel !examples	2m 26s
msys2, CM x86_64 default	6m 57s
msys2, AM x86_64 default R	7m 13s
mingw, CM clang-x86_64 gnutls libssh	5m 28s
mingw, CM x86_64 schannel c-ares U	8m 21s
mingw, CM clang-aarch64 schannel R TrackMemory	3m 3s
mingw, CM x86_64 schannel dev debug	2m 53s
mingw, CM i686 schannel R	2m 23s
mingw, CM ucrt-x86_64 schannel uwp	2m 34s
mingw, AM x86_64 c-ares U	10m 38s
msys2, AM x86_64 default	4m 47s
mingw, CM clang-x86_64 openssl	2m 53s
mingw, AM x86_64 default XP	6m 4s
msys2, AM x86_64 !proxy	8m 31s
	2h 8m 58s

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