Add role="dialog" to improve accessibility

[vinicius73]

• build(deps): bump @nextcloud/vue from 5.3.1 to 5.4.0 #1313
• Update @nextcloud/vue to 6.0.0 #1319

Describe the bug
When we open a file with text app, and click outside of editor, the focus gone back to parent elements of viewer, the file list, menus...

To Reproduce
Steps to reproduce the behavior:

1. Go to files app
2. Click on any markdown file
3. Click outside the editor
4. Use tab key to change the focus and navigate over the elements of the page.

Expected behavior
Focus runs over menu bar of text editor.

Additional context

nextcloud/text#2387
nextcloud/text#2713
nextcloud-libraries/nextcloud-vue#2501

[vinicius73]

nextcloud-libraries/nextcloud-vue#2696