Bump idna to 3.7

[davidu1975]

Bump idna to 3.7

Workflow

• Ticket exists in Jira https://uktrade.atlassian.net/browse/GREATUK-616
• Jira ticket has the correct status.
• A clear/description pull request messaged added.

Housekeeping

• Upgraded any vulnerable dependencies.
• Python requirements have been re-compiled.
• I have checked that my PR is using the latest package versions of: directory-api-client, directory-cms-client, directory-components, directory-forms-api-client, directory-healthcheck, directory-validators

Merging

• This PR can be merged by reviewers. (If unticked, please leave for the author to merge)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.74%. Comparing base (f7e6bb7) to head (f4bfe69).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1029   +/-   ##
========================================
  Coverage    98.74%   98.74%           
========================================
  Files           42       42           
  Lines         1908     1908           
========================================
  Hits          1884     1884           
  Misses          24       24           

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