Fix a clippy issue (#31429)

A cherry-pick from `main`,
https://github.com/zed-industries/zed/pull/31425 , failed with a clippy
error:
https://github.com/zed-industries/zed/actions/runs/15253598167/job/42895919271

Release Notes:

- N/A

crates/client/src/proxy.rs

@@ -39,7 +39,7 @@ enum ProxyType<'t> {
     HttpProxy(HttpProxyType<'t>),
 }
 
-fn parse_proxy_type<'t>(proxy: &'t Url) -> Option<((String, u16), ProxyType<'t>)> {
+fn parse_proxy_type(proxy: &Url) -> Option<((String, u16), ProxyType)> {
     let scheme = proxy.scheme();
     let host = proxy.host()?.to_string();
     let port = proxy.port_or_known_default()?;