Update required ruby version for documentation

[farmio]

Proposed change

Ruby 2.7 doesn't work anymore

bundler (= 2.5.3) required by user-specified dependency

Ruby 3.3 also doesn't work

bundle exec rake generate
## Generating Site with Jekyll
NoMethodError on line ["89"] of /opt/homebrew/lib/ruby/gems/3.3.0/gems/compass-1.0.3/lib/compass/configuration/helpers.rb: undefined method `exists?' for class File

Current Ruby version is 3.1.4 https://github.com/home-assistant/home-assistant.io/blob/current/.ruby-version

Type of change

• Document existing features within Home Assistant
• Document new or changing features which there is an existing pull request elsewhere
• Spelling or grammatical corrections, or rewording for improved clarity
• Changes to the backend of this documentation
• Removed stale or deprecated documentation

Additional information

• This PR fixes or closes issue: fixes #
• Link to relevant existing code or pull request:

[frenck]

Thanks, @farmio 👍

../Frenck