[rubygems/rubygems] Fix some sudo specs to do the right thing on bundler 3

On bundler 3, where the default install path is `.bundle`, these specs
were trying to change permissions of the
`.bundle/ruby/<ruby_abi_version>` folder, which didn't exist yet,so the
permission changing command was failing and the spec was not testing the
right thing.

Change the specs so that the permissions are correctly changed, by first
configuring the local path to be `.bundle` (which creates the `.bundle`
folder), and then changing permissions of the `.bundle` folder
explicitly, which exists already.

https://github.com/rubygems/rubygems/commit/2833162fb0

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