chore: add dependabolt GitHub Action workflow

[malept]

• I have read the contribution documentation for this project.
• I agree to follow the code of conduct that this project follows, as appropriate.
• The changes are appropriately documented (if applicable).
• The changes have sufficient test coverage (if applicable).
• The testsuite passes successfully on my local machine (if applicable).

Summarize your changes:

Automates upgrading dependencies in bolt packages. (Dependabolt = Dependabot + Bolt 😁)

Example action: https://github.com/malept/electron-forge/runs/209394870
Example commit generated and pushed: 1af9f10

[codecov]

Codecov Report

Merging #1123 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1123   +/-   ##
=======================================
  Coverage   68.13%   68.13%           
=======================================
  Files          67       67           
  Lines        1958     1958           
  Branches      378      378           
=======================================
  Hits         1334     1334           
  Misses        451      451           
  Partials      173      173

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