Add explicit dependencies on future bundled gems

[zachmargolis]

Follow-up to #9935, I was checking the release notes here https://www.ruby-lang.org/en/news/2023/12/25/ruby-3-3-0-released/

And since we use bootsnap, this seemed relevant (bolds are mine)

Standard library updates

RubyGems and Bundler warn if users do require the following gems without adding them to Gemfile or gemspec. This is because they will become the bundled gems in the future version of Ruby.

This warning is suppressed if you use bootsnap gem. We recommend to run your application with DISABLE_BOOTSNAP=1 environment variable at least once. This is limitation of this version.

Targeted libraries are:

• abbrev
• base64
• bigdecimal
• csv
• drb
• getoptlong
• mutex_m
• nkf
• observer
• racc
• resolv-replace
• rinda
• syslog