remove some dependencies

[baggepinnen]

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[JuliaControlBot]

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[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.80%. Comparing base (a5c92ef) to head (ed4e3ae).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/ControlSystemsBase/src/pid_design.jl	66.66%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #959   +/-   ##
=======================================
  Coverage   92.80%   92.80%           
=======================================
  Files          41       41           
  Lines        4974     4974           
=======================================
  Hits         4616     4616           
  Misses        358      358           

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