feat: add msi support

[6d7a]

What has been done

Adds windows .msi builds as a release artifact.
Closes #1174

Validation

• Download the windows build artifacts from one of the CI runs
• Install the .msi
• Run ggshield --version from a new terminal session (the installer should have added ggshield to the PATH)

PR check list

• As much as possible, the changes include tests (unit and/or functional)
• If the changes affect the end user (new feature, behavior change, bug fix) then the PR has a changelog entry (see doc/dev/getting-started.md). If the changes do not affect the end user, then the skip-changelog label has been added to the PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.92%. Comparing base (d3b9004) to head (ba7edfa).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1207      +/-   ##
==========================================
+ Coverage   92.85%   92.92%   +0.06%     
==========================================
  Files         168      169       +1     
  Lines        8178     8309     +131     
==========================================
+ Hits         7594     7721     +127     
- Misses        584      588       +4     

Flag	Coverage Δ
unittests	92.92% <ø> (+0.06%)	⬆️

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