fix(dependabot): remove config

[redallen]

What: Now that renovate bot is working well (#4901) we don't need dependabot.

Additional issues:

[patternfly-build]

PF4 preview: https://patternfly-react-pr-4908.surge.sh
A11y report: https://patternfly-react-pr-4908-a11y.surge.sh

[codecov-commenter]

Codecov Report

Merging #4908 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4908   +/-   ##
=======================================
  Coverage   52.75%   52.75%           
=======================================
  Files         525      525           
  Lines        9469     9469           
  Branches     3483     3483           
=======================================
  Hits         4995     4995           
  Misses       3847     3847           
  Partials      627      627           

Flag	Coverage Δ
#patternfly4	52.75% <ø> (ø)

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[ddonahue007]

LGTM