Add new version line: bundler 4.0.1

[cf-buildpacks-eng]

Please edit the dependency-builds pipeline to add the new version line to the relevant dependency/buildpack.

For nginx/nginx-static: Also remove older mainline/stable version.
E.g. If you are adding nginx 1.22, you will remove 1.20. If you are adding 1.23, you will remove 1.21

{source:{name:bundler,type:rubygems},version:{ref:4.0.1,sha256:1d1a19f59f45ae0d9c0698ce0c50a58028963af65e28d755cd6ced017fe7bd39,url:https://github.com/ruby/rubygems/tree/master/bundlertree/v4.0.1}}