Update dependency vanilla-framework to v3.1.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
vanilla-framework (source)	3.1.0 -> 3.1.1

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Release Notes

canonical-web-and-design/vanilla-framework

### [`v3.1.1`](https://togithub.com/canonical-web-and-design/vanilla-framework/releases/v3.1.1) [Compare Source](https://togithub.com/canonical-web-and-design/vanilla-framework/compare/v3.1.0...v3.1.1) #### Getting Vanilla Framework Install with NPM: https://www.npmjs.com/package/vanilla-framework Visit the documentation at https://vanillaframework.io/docs #### New in Vanilla v3.1.1 ##### 🐛 Bug Fixes - Fix visited links in dark side navigation ([#​4342](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4342)) ##### 📝 Documentation - Add new sections to Notification docs ([#​4333](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4333)) - Add demo of class reference to side navigation component ([#​4328](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4328)) - Update modal accessibility docs ([#​4311](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4311)) ##### 🔨 Maintenance - Update dependency canonicalwebteam.flask-base to v1.0.1 ([#​4330](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4330)) - Lock MarkupSafe at version 2.0.1 ([#​4325](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4325)) - Update list examples to use list elements ([#​4302](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4302)) - Replace `` with `` pull-quotes ([#​4300](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4300)) - Button's processing state's width and height is set to initial width and height ([#​4289](https://togithub.com/canonical-web-and-design/vanilla-framework/issues/4289)) **Full Changelog**: https://github.com/canonical-web-and-design/vanilla-framework/compare/v3.1.0...v3.1.1

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