[3.13] gh-124217, ipaddress: Add RFC 9637 reserved IPv6 block 3fff::/20
(GH-124240)
#124282
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(cherry picked from commit db6eb36)
Co-authored-by: Y5 124019959+y5c4l3@users.noreply.github.com
Signed-off-by: y5c4l3 y5c4l3@proton.me