Fix flickering scrollbar when using progress-spinner

[NoUsername]

Breaking change

Proposed change

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes Config flow progress dialog: Flickering scrollbar #7213
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• Tests have been added to verify that the new code works.

test screencap:

NOTE: it would be awesome if you could mark this PR with hacktoberfest-accepted when done, thanks!

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io