Debian 11: DLA-4163-1 critical: rubygems code execution risks

CVE-2021-43809

In bundler versions before 2.2.33, when working with untrusted and
apparently harmless `Gemfile`'s, it is not expected that they lead to
execution of external code, unless that's explicit in the ruby code inside
the `Gemfile` itself. However, if the `Gemfile` includes `gem` entries that
use the `git` option with invalid, but seemingly harmless, values with a
leading dash, this can be false. To handle dependencies that come from a
Git repository instead of a registry, Bundler uses various commands, such
as `git clone`. These commands are being constructed using user input
(e.g. the repository URL). When building the commands, Bundler versions
before 2.2.33 correctly avoid Command Injection vulnerabilities by passing
an array of arguments instead of a command string. However, there is the
possibility that a user input starts with a dash (`-`) and is therefore