chore(deps): update update mend renovate docker images to v13.4.0

[renovate]

This PR contains the following updates:

Package	Update	Change
ghcr.io/mend/renovate-ce	minor	13.3.0 → 13.4.0
ghcr.io/mend/renovate-ee-server	minor	13.3.0 → 13.4.0
ghcr.io/mend/renovate-ee-worker	minor	13.3.0-full → 13.4.0-full

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