Bump maatwebsite/excel from 3.1.30 to 3.1.31

Created by: dependabot[bot]

Bumps maatwebsite/excel from 3.1.30 to 3.1.31.

Changelog

Sourced from maatwebsite/excel's changelog.

[3.1.31] - 2021-06-02

Added

• Custom heading row formatter can use column index (#3166)
• Added WithFormatData concern (#3154)

Fixed

• Create failures of rows than didn't exists but where requested in row validation
• Fix Bug Formulas are not calculated when import implements WithCalculatedFormulas with SkipsEmptyRows #3127
• PhpSpreadsheet 1.18 support

Commits

• cbe6370 Update CHANGELOG.md
• 24a967d Update CHANGELOG.md
• d6dc342 Update CHANGELOG.md
• 3690d8c Bump phpspreadsheet version to 1.18
• c850d08 Update stale.yml
• 60b8bf2 Fix Bug #3127 Formulas are not calculated when import implements … (#3192)
• 689edcf Create stale.yml
• 73ad638 Update 1_Bug_report.md
• 7c5fcfa Update CHANGELOG.md
• 937800f Maatwebsite/Laravel-Excel#3153 (#3154)
• Additional commits viewable in compare view

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