fix/distance parameter type for v2.x

[tkaratug]

This pull request addresses a type mismatch issue in the scopeWithinDistanceTo method and related methods in the laravel-spatial package. The $distance parameter type has been updated from int to float to better handle decimal distance values returned by the ST_Distance function. The changes ensure compatibility with spatial queries that rely on precise distance calculations.

Parameter Type Update for Spatial Methods:

• CHANGELOG.md: Documented the fix for $distance parameter type from int to float in scopeWithinDistanceTo and related methods.
• src/Traits/HasSpatial.php: Updated the $distance parameter type in the scopeWithinDistanceTo method from int to float.
• src/Traits/HasSpatial.php: Updated the $distance parameter type in the withinDistanceToMysqlAndPostgres private method from int to float.
• src/Traits/HasSpatial.php: Updated the $distance parameter type in the withinDistanceToMariaDb private method from int to float.