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?

检查引用行中的 com.visualstudio.code.yaml，并将 stable branch 的设置与 issue 中描述的 VS Code extension 版本要求进行比较。在任何 manifest 更改后验证 stable branch 上的 podman-remote extension，并确认能够发现具有预期版本的 extensions。

由索引模型根据 Issue 内容生成。