chore: remove unnecessary redeclarations in for loops (#18440)

tailnet/configmaps_internal_test.go

@@ -1116,7 +1116,6 @@ func TestConfigMaps_updatePeers_nonexist(t *testing.T) {
 		proto.CoordinateResponse_PeerUpdate_DISCONNECTED,
 		proto.CoordinateResponse_PeerUpdate_LOST,
 	} {
-		k := k
 		t.Run(k.String(), func(t *testing.T) {
 			t.Parallel()
 			ctx := testutil.Context(t, testutil.WaitShort)

tailnet/convert_test.go

@@ -64,7 +64,6 @@ func TestNode(t *testing.T) {
 	}
 
 	for _, tc := range testCases {
-		tc := tc
 		t.Run(tc.name, func(t *testing.T) {
 			t.Parallel()
 			p, err := tailnet.NodeToProto(&tc.node)

tailnet/telemetry_internal_test.go

@@ -121,7 +121,6 @@ func TestTelemetryStore(t *testing.T) {
 		}
 
 		for _, c := range cases {
-			c := c
 			t.Run(c.name, func(t *testing.T) {
 				t.Parallel()
 				telemetry, err := newTelemetryStore()