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

backtester/common/common_test.go

@@ -89,6 +89,7 @@ func TestCanTransact(t *testing.T) {
 			expected: false,
 		},
 	} {
+		ti := ti
 		t.Run(ti.side.String(), func(t *testing.T) {
 			t.Parallel()
 			if CanTransact(ti.side) != ti.expected {
@@ -123,6 +124,7 @@ func TestDataTypeConversion(t *testing.T) {
 			expectErr: true,
 		},
 	} {
+		ti := ti
 		t.Run(ti.title, func(t *testing.T) {
 			t.Parallel()
 			got, err := DataTypeToInt(ti.dataType)