[FIX] pkgmeta: Support PEP-610 direct_url.json #484

Job	Run time
test (ubuntu-20.04, 3.9, PyQt5~=5.14.0)	1m 34s
test (ubuntu-20.04, 3.10, PyQt5~=5.15.0)	1m 33s
test (ubuntu-20.04, 3.11, PyQt5~=5.15.0)	1m 23s
test (ubuntu-20.04, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	1m 28s
test (ubuntu-22.04, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	1m 26s
test (ubuntu-22.04, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0, glibc-tools)	2m 1s
test (ubuntu-22.04, 3.13, PyQt6~=6.7.0 PyQt6-Qt6~=6.7.0, glibc-tools)	1m 41s
test (macos-13, 3.9, PyQt5~=5.14.0)	1m 41s
test (macos-13, 3.10, PyQt5~=5.15.0)	1m 13s
test (macos-14, 3.11, PyQt5~=5.15.0)	46s
test (macos-15, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	48s
test (macos-latest, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	47s
test (macos-latest, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	51s
test (macos-latest, 3.13, PyQt6~=6.7.0 PyQt6-Qt6~=6.7.0)	54s
test (windows-2019, 3.9, PyQt5~=5.15.0)	2m 11s
test (windows-2019, 3.10, PyQt5~=5.15.0)	2m 25s
test (windows-2019, 3.11, PyQt5~=5.15.0)	2m 20s
test (windows-2019, 3.11, PyQt6~=6.2.3 PyQt6-Qt6~=6.2.3)	2m 16s
test (windows-2019, 3.11, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	2m 35s
test (windows-2019, 3.12, PyQt6~=6.5.0 PyQt6-Qt6~=6.5.0)	2m 16s
test (windows-2019, 3.13, PyQt6~=6.7.0 PyQt6-Qt6~=6.7.0)	3m 5s
	35m 14s

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