Update dependency maatwebsite/excel to v3.1.39

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
maatwebsite/excel	require	patch	3.1.38 -> 3.1.39

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Release Notes

Maatwebsite/Laravel-Excel

### [`v3.1.39`](https://togithub.com/Maatwebsite/Laravel-Excel/blob/HEAD/CHANGELOG.md#​3139---2022-04-23) [Compare Source](https://togithub.com/Maatwebsite/Laravel-Excel/compare/3.1.38...3.1.39) ##### Fixed - Fix PHP8.1 return type for Failure class ([#​3588](https://togithub.com/Maatwebsite/Laravel-Excel/issues/3588))

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