Fix wrong uri in task extension

[nkylstad]

Description

The URI referenced http://altinn.no, but should have referenced http://altinn.no/process. This resulted i 2 competing namespaces for processes which already had the http://altinn.no/process namespace.

Related Issue(s)

Verification

• Your code builds clean without any errors or warnings
• Manual testing done (required)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3d3add3) 86.42% compared to head (e9d1c01) 86.42%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #12231   +/-   ##
=======================================
  Coverage   86.42%   86.42%           
=======================================
  Files        1188     1188           
  Lines       18045    18045           
  Branches     2290     2290           
=======================================
  Hits        15595    15595           
  Misses       2163     2163           
  Partials      287      287           

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[ghost]

LGTM😄