Update Gemfile.lock (#1140)
Update Gemfile.lock (#1140)

Whilst Dependabot keeps the top-level deps up to date, it doesn't
update subdependency versions if they already satisfy the parent
package's dependency range.

Changes generated by `bundle update`.

Closes @W-8619637@.

[skip changelog]
heroku/heroku-buildpack-python,heroku/heroku-buildpack-python,Scalingo/python-buildpack,Scalingo/python-buildpack,AltSchool/heroku-buildpack-python,AltSchool/heroku-buildpack-python