Pub check versions does not work when proxy is configured in IDE

[vbebekin]

When a proxy is configured in Android Studio, the Pub check versions feature in Flutter Enhancement Suite does not work.
It seems that the plugin doesn’t use the IDE’s proxy settings when making network requests to pub.dev.

Steps to Reproduce

1. Open Android Studio → Settings → Appearance & Behavior → System Settings → HTTP Proxy.
2. Configure any working proxy (manual or automatic).
3. Open a Flutter project.
4. The plugin does not highlight packages that have newer versions available.

Expected behavior

The plugin should:

• Automatically use the proxy settings configured in Android Studio, or
• Provide an option to manually configure proxy settings inside the plugin.

Screenshots
N/A — the issue can be reproduced without visible errors; packages simply aren’t highlighted as outdated.