Log Message:
p5-URI: update to 5.21.

5.21      2023-08-23 16:02:14Z
    - Fix version declarations in icap.pm and icaps.pm (GH#131) (Olaf Alders)

5.20      2023-08-23 14:13:23Z
   - Remove Shebang and Taint from all tests.
   - Fix t/query.t to get rid of a warning about join() on
      array with undef
   - Add icap and icaps URIs (GH#130) (david-dick)