[Mend] Update Werkzeug to 3.0.3 in Fetch

[mikaylathompson]

Description

I don't have particularly high hopes for this one, but Mend now says that Werkzeug needs to be at 3.0.3 due to a new concern (previously it needed to be at 3.0.1). Somewhat confusingly, both the old (satisfied by 3.0.1) and new (needs 3.0.3) vulnerabilities are handled in issue #402 .

Issues Resolved

If we're very lucky, #402

Testing

Ran the fetch unit tests

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.31%. Comparing base (d5f9290) to head (f02e9c5).
Report is 20 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #707      +/-   ##
============================================
+ Coverage     63.21%   63.31%   +0.09%     
- Complexity     1566     1568       +2     
============================================
  Files           218      218              
  Lines          8820     8820              
  Branches        773      773              
============================================
+ Hits           5576     5584       +8     
+ Misses         2838     2832       -6     
+ Partials        406      404       -2     

Flag	Coverage Δ
unittests	63.31% <ø> (+0.09%)	⬆️

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