Bump yard from 0.9.38 to 0.9.40 #6

	# Integration tests against a real proxy (PROXY_URL). Add repository secret PROXY_URL
	# under Settings → Secrets and variables → Actions, then mark this workflow as a required
	# status check under branch protection (pull_request events only receive secrets for PRs
	# from the same repository, not from forks).

	name: Proxy integration tests

	on:
	pull_request:

	permissions:
	contents: read

	jobs:
	integration:
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v6
	with:
	persist-credentials: false

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	bundler-cache: true
	ruby-version: ruby

	- name: Require PROXY_URL Actions secret
	env:
	PROXY_URL: ${{ secrets.PROXY_URL }}
	run: \|
	if [ -z "${PROXY_URL}" ]; then
	echo "::error::PROXY_URL is not set. Add a repository (or environment) secret named PROXY_URL under Settings → Secrets and variables → Actions."
	exit 1
	fi

	- name: Run integration tests
	env:
	PROXY_URL: ${{ secrets.PROXY_URL }}
	run: bundle exec ruby test/test_proxy_headers.rb

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