CI: Bump go version, linters and fix minor issues (#1130)

* CI: Bump go version, linters and fix minor issues

* Bump version, fix loop variables

* Revert

* Rid TODOs now that 1.51 has been released

exchanges/order/order_test.go

@@ -1665,6 +1665,7 @@ func TestIsOrderPlaced(t *testing.T) {
 	}
 	// specific tests
 	for num, tt := range statusTests {
+		num := num
 		tt := tt
 		t.Run(fmt.Sprintf("TEST CASE: %d", num), func(t *testing.T) {
 			t.Parallel()