Update dependency gitlab-ci-utils/gitlab-ci-templates to v11

This MR contains the following updates:

Package	Type	Update	Change
gitlab-ci-utils/gitlab-ci-templates	repository	major	10.0.0 -> 11.0.0

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Release Notes

gitlab-ci-utils/gitlab-ci-templates

v11.0.0

Compare Source

Changed

• BREAKING: Updated pa11y-ci job to gitlab-pa11y-ci v6.0.0 image.
• BREAKING: Update pagean job to pagean@7.0.0
• Added lint_nunjucks job to lint Nunjucks files with djlint. (#​196)
• Added .djlint template to lint various formats with djlint. (#​196)

Fixed

• Updated prepare_release job to gitlab-releaser@4.0.1
• Updated lint_md job to markdownlint-cli@0.32.1
• Updated lint_lockfile job to lockfile-lint@4.7.7.

Miscellaneous

• Update renovate config to manage pip package versions installed in templates. (#​196)

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This MR has been generated by Renovate Bot.