Fix context usage (#33554) (#33557)

Backport #33554

services/auth/sspi.go

@@ -89,7 +89,7 @@ func (s *SSPI) Verify(req *http.Request, w http.ResponseWriter, store DataStore,
 		store.GetData()["EnableSSPI"] = true
 		// in this case, the Verify function is called in Gitea's web context
 		// FIXME: it doesn't look good to render the page here, why not redirect?
-		gitea_context.GetWebContext(req).HTML(http.StatusUnauthorized, tplSignIn)
+		gitea_context.GetWebContext(req.Context()).HTML(http.StatusUnauthorized, tplSignIn)
 		return nil, err
 	}
 	if outToken != "" {