Bump vendor/github.com/twbs/bootstrap-rubygem (#105)

Bumps [vendor/github.com/twbs/bootstrap-rubygem](https://github.com/twbs/bootstrap-rubygem) from `f1f92e0` to `ce9dfc2`.
- [Release notes](https://github.com/twbs/bootstrap-rubygem/releases)
- [Commits](twbs/bootstrap-rubygem@f1f92e0...ce9dfc2)

---
updated-dependencies:
- dependency-name: vendor/github.com/twbs/bootstrap-rubygem
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>