Directory name is not properly extracted from branch name when using `-` separator.

[dreid]

Given a branch name like dependabot-pip-dirname-stripe-8.1.0
fetch-metadata produces metadata like:

  outputs.dependency-names: stripe
  outputs.dependency-type: direct:production
  outputs.update-type: version-update:semver-major
  outputs.directory: /dirname-stripe
  outputs.package-ecosystem: pip
  outputs.target-branch: trunk
  outputs.previous-version: 3.5.0
  outputs.new-version: 8.1.0
  outputs.compatibility-score: 0
  outputs.maintainer-changes: false
  outputs.dependency-group: 
  outputs.alert-state: 
  outputs.ghsa-id: 
  outputs.cvss: 0

The directory of /dirname-stripe is obviously incorrect the correct directory should be /dirname

[jeffwidman]

I think #450 fixed this?