update dependencies & adjust code accordingly #20

	---
	# gratefully copied and adjusted from docker-mailserver/docker-mailserver
	name: Documentation

	on: # yamllint disable-line rule:truthy
	workflow_dispatch:
	push:
	branches: [master]
	paths:
	- .github/workflows/documentation.yml
	- documentation/**
	tags: ['[0-9]+.[0-9]+*']

	permissions:
	contents: write

	defaults:
	run:
	working-directory: documentation

	env:
	CACHE_ID: unknown

	jobs:
	deployment:
	name: Deployment
	runs-on: ubuntu-24.04
	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Setup Python 3
	uses: actions/setup-python@v5
	with:
	python-version: 3.x

	- name: Prepare CACHE_ID
	run: echo "CACHE_ID=$(date --utc '+%V')" >>"${GITHUB_ENV}"

	- name: Setup cache
	uses: actions/cache@v4
	with:
	key: mkdocs-material-${{ env.CACHE_ID }}
	path: .cache
	restore-keys: \|
	mkdocs-material-

	- name: Install Python dependencies
	run: pip install mkdocs-material==9.5.4

	- name: Deploy documentation
	run: mkdocs gh-deploy --strict --force

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