Update dependency unleashedtech/php-coding-standard to v3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
unleashedtech/php-coding-standard	require-dev	major	^2.7 -> ^2.7 \|\| ^3.0

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Release Notes

unleashedtech/php-coding-standard

### [`v3.1.1`](https://togithub.com/unleashedtech/php-coding-standard/releases/tag/v3.1.1) [Compare Source](https://togithub.com/unleashedtech/php-coding-standard/compare/v3.1.0...v3.1.1) ##### Fixed - Cached first namespace pointer for faster performance - [#​17](https://togithub.com/unleashedtech/php-coding-standard/issues/17) ### [`v3.1.0`](https://togithub.com/unleashedtech/php-coding-standard/releases/tag/v3.1.0) [Compare Source](https://togithub.com/unleashedtech/php-coding-standard/compare/v3.0.0...v3.1.0) #### Added - Added new `Unleashed.Commenting.InheritDocFormat` sniff to ensure `{@​inheritDoc}` comments are styled consistently ### [`v3.0.0`](https://togithub.com/unleashedtech/php-coding-standard/releases/tag/v3.0.0) [Compare Source](https://togithub.com/unleashedtech/php-coding-standard/compare/v2.7.0...v3.0.0) #### Added Added several new sniffs for PHP 8 code: - RequireNullSafeObjectOperator - RequireNonCapturingCatch - RequireTrailingCommaInDeclaration - UnionTypeHintFormat #### Changed - Upgraded base code standard (slevomat/coding-standard) to ^7.0.1 #### Removed - Removed deprecated UnusedPrivateElements sniff

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