fix(fqdn): allow hyphens in last domain label (#1548)

## Fixes Or Enhances
## Summary

The `fqdn` validator was rejecting valid domain names that contain
hyphens in the last label (e.g. `test-site-http.test-site`), because the
TLD character class `[a-zA-Z0-9]` did not include `-`.

## Change

One character added to the last label's character class in
`fqdnRegexStringRFC1123`:


No other parts of the regex were modified.
 
## Test
 
Added regression case to
[TestFQDNValidation](cci:1://file:///Users/admin/validator/validator_test.go:10628:0-10676:1):
 
- `test-site-http.test-site` → valid

@go-playground/validator-maintainers