[openstreetmap/openstreetmap-website] Remove ruby-dev and ruby-bundler dependencies (PR #6331)

[rkoeze]

### Description
This PR makes 2 changes to the Dockerfile:
1. Removes `ruby-bundler` as bundler has been installed as a default gem since [ruby 2.6.0](https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/).
2. Removes `ruby-dev` because header files for compiling extensions are already present in `ruby:3.2-bookworm`.

### How has this been tested?
 The tests pass. I also ran `docker run --rm ruby:3.2-bookworm bundler -v` as a quick sanity check for change 1. I ran `docker run --rm ruby:3.2-bookworm ruby -rrbconfig -e 'puts RbConfig::CONFIG["rubyhdrdir"]'` as a sanity check for change 2.





You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6331

-- Commit Summary --

  * Remove ruby-dev and ruby-bundler dependencies

-- File Changes --

    M Dockerfile (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6331.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6331.diff

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