Pin dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
behat/behat (source)	require-dev	pin	^3.7 -> 3.7.0
markdownlint-cli	devDependencies	pin	^0.24.0 -> 0.24.0
phpmd/phpmd (source)	require-dev	pin	^2.9 -> 2.9.1
phpstan/phpstan	require-dev	pin	^0.12.52 -> 0.12.52
povils/phpmnd	require-dev	pin	^2.3 -> 2.3.0
squizlabs/php_codesniffer	require-dev	pin	^3.5 -> 3.5.8

:pushpin: Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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