go-playground / validator / 15421773123

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Fix: support validation for map values with struct types (#1433)

## Fixes 

Fixed support for validating struct values inside map fields.
Previously, if no tag followed `endkeys`, the struct values were
skipped. This PR ensures such struct values are still validated
according to their own tags.

### Enhancements to validation logic:
* Updated `validator.go` to handle map values that are structs or
pointers to structs by diving into their fields for validation.
* Added test cases covering struct validation in maps, including basic
rules, pointer structs, nested structs, and edge cases like nil
pointers.

Check #1430 for more details.

**Make sure that you've checked the boxes below before you submit PR:**
- [x] Tests exist or have been written that cover this particular
change.

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