Update registry.gitlab.com/pipeline-components/markdownlint Docker tag to v0.13.4

This MR contains the following updates:

Package	Type	Update	Change
registry.gitlab.com/pipeline-components/markdownlint	image	patch	0.13.3 -> 0.13.4

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Release Notes

pipeline-components/markdownlint (registry.gitlab.com/pipeline-components/markdownlint)

v0.13.4

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