Data model generation failing

[nickevansuk]

There appears to be an error here:

models-ruby/.github/workflows/create-data-model-pr.yaml

Lines 46 to 51 in a21cdc5

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 3.0
	bundler-cache: true # runs 'bundle install' and caches installed gems automatically
	working-directory: ./models-ruby/

Data model generation appears to be failing:

https://github.com/openactive/models-ruby/runs/5216156909?check_suite_focus=true

Run ruby/setup-ruby@v1
Modifying PATH
Downloading Ruby
Extracting  Ruby
Print Ruby version
Installing Bundler
bundle install
  /opt/hostedtoolcache/Ruby/3.1.0/x64/bin/bundle config --local path /home/runner/work/models-ruby/models-ruby/models-ruby/vendor/bundle
  /opt/hostedtoolcache/Ruby/3.1.0/x64/bin/bundle lock
  Fetching gem metadata from https://rubygems.org/.........
  Resolving dependencies...
  Bundler could not find compatible versions for gem "bundler":
    In Gemfile:
      bundler (~> 2.2.13)
  
    Current Bundler version:
      bundler (2.3.7)
  
  Your bundle requires a different version of Bundler than the one you're running.
  Install the necessary version with `gem install bundler:2.2.[33](https://github.com/openactive/models-ruby/runs/5216156909?check_suite_focus=true#step:9:33)` and rerun
  bundler using `bundle _2.2.33_ lock`
  Took   1.99 seconds

To test any fix this, a branch needs to be created, and the GitHub Workflow run manually via the "Run workflow" button on https://github.com/openactive/models-ruby/actions/workflows/create-data-model-pr.yaml for that specific branch.