Fix datagateway-download e2e tests broken by minting api update

[louise-davies]

Description

The minting api wasn't pinned in the CI (due to it only having tagged containers later in development than the original CI script) and so the release of v0.3.0 a couple of weeks ago broke the CI. I've now pinned the api to v0.3.0 and updated the broken test (just the format of an error message had changed)

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.39%. Comparing base (1cdb0e3) to head (49a9aa4).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1681   +/-   ##
========================================
  Coverage    95.39%   95.39%           
========================================
  Files          183      183           
  Lines         7932     7932           
  Branches      2516     2516           
========================================
  Hits          7567     7567           
  Misses         330      330           
  Partials        35       35           

Flag	Coverage Δ
common	94.27% <ø> (ø)
dataview	97.32% <ø> (ø)
download	96.03% <ø> (ø)
search	93.58% <ø> (ø)

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