Set up Dependabot for pip, github-actions, bundler and docker

[mmorel-35]

Description

Set up dependabot to enable automatic dependency management for pip, github-actions, bundler and docker I had to regenerate gemfile.lock as github found it unparseable

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Contribution checklist

• [X] I have read the Contributing Guidelines.
• [X] The commits refer to an active issue in the repository.
• [X] I have added automated testing to cover this case.

[codecov[bot]]

Codecov Report

Merging #468 (f583520) into main (473e4fe) will increase coverage by 0.39%. The diff coverage is n/a.

:exclamation: Current head f583520 differs from pull request most recent head 5a1a7a8. Consider uploading reports for the commit 5a1a7a8 to get more accurate results

@@            Coverage Diff             @@
##             main     #468      +/-   ##
==========================================
+ Coverage   63.67%   64.06%   +0.39%     
==========================================
  Files          43       43              
  Lines        2431     2424       -7     
==========================================
+ Hits         1548     1553       +5     
+ Misses        883      871      -12     

Impacted Files	Coverage Δ
kube_hunter/core/events/handler.py	89.86% <0.00%> (-0.68%)	:arrow_down:
kube_hunter/modules/hunting/apiserver.py	72.34% <0.00%> (+1.92%)	:arrow_up:
kube_hunter/modules/discovery/hosts.py	55.36% <0.00%> (+2.10%)	:arrow_up:

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