refactor: use any instead of interface{}

[chenyahui]

Fixes Or Enhances

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: 73.849%. remained the same when pulling 4e6a854 on chenyahui:interface_to_any into 94a637a on go-playground:master.

[deankarn]

Sorry @chenyahui but this is a breaking change for anyone using Go 1.17 or below as you saw when needing to remove that from the CI test matrix to enable CI to pass.

I unfortunately cannot make such an update until cutting a new major version.