Fix integer overflows in test when run on 32bit systems

[gibmat]

Fixes Or Enhances

While 32bit systems are becoming rarer, Debian still fully supports armhf. On such systems, TestLuhnChecksumValidation fails because some of the integer values overflow without an explicit cast to int64.

# github.com/go-playground/validator/v10 [github.com/go-playground/validator/v10.test]
./validator_test.go:13914:4: cannot use 586824160825533338 (untyped int constant) as int value in struct literal (overflows)
./validator_test.go:13917:4: cannot use 586824160825533328 (untyped int constant) as int value in struct literal (overflows)
./validator_test.go:13919:4: cannot use 10000000116 (untyped int constant) as int value in struct literal (overflows)
./validator_test.go:13921:4: cannot use 10000000117 (untyped int constant) as int value in struct literal (overflows)

Make sure that you've checked the boxes below before you submit PR:

• Tests exist or have been written that cover this particular change.

@go-playground/validator-maintainers

[coveralls]

coverage: 73.73%. remained the same
when pulling d85a8af on gibmat:fix-32bit-test-failures
into 2d3af3d on go-playground:master.

[nodivbyzero]

LGTM