Deprecating Polymer

[GSzabados]

Describe the bug
HA is deprecating Polymer. The only card where I found code from Polymer in my setup is the spotify-card, but I cannot see any warnings in my log regarding accessing Polymer. Is Polymer really used? If not, could be removed from the code then?

https://developers.home-assistant.io/blog/2023/04/04/deprecating_polymer/

• Reproducable on a plain lovelace panel without card, style or theme mods
• Using latest version of spotcast and spotify-card [ ]
• Using latest stable version of Home Assistant
• I have Spotify Premium
• I have setup the Spotify integration in Home Assistant

To Reproduce

Expected behavior
Deprecating Polymer and replacing with Lit.

Screenshots

Environment (please complete the following information):

• OS: [e.g. iOS]
• Browser: [e.g. chrome, safari]
• Version: [ ]
• HA version: [2023.4.x]
• spotcast version: [ latest]

Configuration

Additional context