Replace deprecated usages of `assert.ErrorType`

[laurazard]

- What I did

- How I did it

- How to verify it

- Description for the changelog

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.01%. Comparing base (ddd4c39) to head (508337b). Report is 632 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5312      +/-   ##
==========================================
- Coverage   61.45%   61.01%   -0.45%     
==========================================
  Files         299      296       -3     
  Lines       20855    20847       -8     
==========================================
- Hits        12816    12719      -97     
- Misses       7124     7211      +87     
- Partials      915      917       +2     

[thaJeztah]

FWIW, I opened a PR to see if un-deprecating is acceptable;

• https://github.com/gotestyourself/gotest.tools/pull/286

[thaJeztah]

New version of gotest.tools was released that un-deprecates this; I opened a PR to update to that version;

• https://github.com/docker/cli/pull/5808

[laurazard]

Yayyy 🥳 Will close this.