ci: disable auto dependency upgrades

[samuelallan72]

Description

We're no longer maintaining this, so we don't want to deal with the automated dependency upgrade PRs.

Supporting information

Ref: #482 (comment)

Private-ref: https://tasks.opencraft.com/browse/SE-6622

Testing instructions

• verify this is what we want
• verify this correctly removes all references to the auto dep updates

Author concerns

Do we want to just archive this repo completely, rather than removing this? If we're not maintaining this any more, archiving is probably the way to go. cc @bradenmacdonald

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.04%. Comparing base (b89d041) to head (2308863).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #483   +/-   ##
=======================================
  Coverage   45.04%   45.04%           
=======================================
  Files          40       40           
  Lines        3303     3303           
  Branches      401      401           
=======================================
  Hits         1488     1488           
  Misses       1768     1768           
  Partials       47       47           

Flag	Coverage Δ
unittests	45.04% <ø> (ø)

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