Update dependency maatwebsite/excel to v3.1.38

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
maatwebsite/excel	require	patch	3.1.37 -> 3.1.38

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Release Notes

Maatwebsite/Laravel-Excel

### [`v3.1.38`](https://togithub.com/Maatwebsite/Laravel-Excel/blob/HEAD/CHANGELOG.md#​3138---2022-03-24) [Compare Source](https://togithub.com/Maatwebsite/Laravel-Excel/compare/3.1.37...3.1.38) ##### Changed - Adds concern `WithGroupedHeadingRow` to allow imported sheets to group the values of columns with the same header in an array ##### Fixed - Fix for `prepareForValidation` callback not being called when using `SkipsEmptyRows`

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