Bump minimal ruby 2.5->2.7 #5900

	name: Docs

	on:
	pull_request:
	types: [opened, reopened, edited, synchronize]
	paths:
	- .github/workflows/docs.yaml
	- bolt.gemspec
	- Gemfile
	- Puppetfile
	- bolt-modules/**
	- documentation/**
	- lib/bolt/**
	- modules/**
	- pwsh_module/**
	- rakelib/docs.rake

	jobs:

	docs:
	name: Docs
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	- name: Setup Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 2.7
	bundler-cache: true
	- name: Update gems
	run: bundle update
	- name: Generate docs
	run: bundle exec rake docs:all
	- name: Run DITA
	uses: dita-ot/dita-ot-action@master
	with:
	dita-ot-version: 4.1.2
	build: dita -i documentation/bolt.ditamap -o out -f html5 --processing-mode=strict

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