Drop obsolete dev dependency `flake8-formatter-abspath`

[jakob-keller]

Description of Change

Removes obsolete dev dependency flake8-formatter-abspath

Assumptions

flake8-formatter-abspath may be considered nice-to-have, i.e. it simply improves readability of flake8 results.

Checklist for All Submissions

• [ ] I have added change info to CHANGES.rst
• [ ] If this is resolving an issue (needed so future developers can determine if change is still necessary and under what conditions) (can be provided via link to issue with these details): closes #1050
  • [ ] Detailed description of issue
  • [ ] Alternative methods considered (if any)
  • [ ] How issue is being resolved
  • [ ] How issue can be reproduced

[codecov[bot]]

Codecov Report

Merging #1051 (17dc78d) into master (9d92ef2) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1051   +/-   ##
=======================================
  Coverage   86.38%   86.38%           
=======================================
  Files          60       60           
  Lines        5803     5803           
=======================================
  Hits         5013     5013           
  Misses        790      790           

Flag	Coverage Δ
unittests	86.38% <ø> (ø)

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