chore: Close idle connections on test cleanup (#4993)

It's possible that this was the source of a leak on Windows...

cli/server.go

@@ -568,6 +568,7 @@ func Server(vip *viper.Viper, newAPI func(context.Context, *coderd.Options) (*co
 						InsecureSkipVerify: true,
 					},
 				}
+				defer client.HTTPClient.CloseIdleConnections()
 			}
 
 			// Since errCh only has one buffered slot, all routines

cli/server_test.go

@@ -425,6 +425,7 @@ func TestServer(t *testing.T) {
 				},
 			},
 		}
+		defer client.HTTPClient.CloseIdleConnections()
 
 		// Use the first certificate and hostname.
 		client.URL.Host = "alpaca.com:443"