Flatpak extentions do not work on Stable branch

> For anybody else having a problem with `podman-remote` not showing up, the relevant line that `com.visualstudio.code` has to change is at https://github.com/flathub/com.visualstudio.code/blob/master/com.visualstudio.code.yaml#L35. As of this writing, the latest version of VS Code only looks for extensions with the version '25.08'. Therefore, you must install an extension with that same version for it to work. You need to keep an eye on any version changes for VS Code itself and then update your extensions accordingly when possible.

_Originally posted by @justinjereza in [#60](https://github.com/flathub/com.visualstudio.code.tool.podman/issues/60#issuecomment-4224746701)_

https://github.com/flathub/com.visualstudio.code/blob/cc38321125fdb22339244a0e7b090f53c1dd350c/com.visualstudio.code.yaml#L35
Should we put `stable` here?