json-glib.wrap: pin to 1.6.0 tag
Newer than the 1.4 branch, and circumvents a bug in the docs/meson.build file on Windows ("Method 'get_pkgconfig_variable()' is invalid for an internal dependency").
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Newer than the 1.4 branch, and circumvents a bug in the docs/meson.build file on Windows ("Method 'get_pkgconfig_variable()' is invalid for an internal dependency").