chore(deps): update dependency slevomat/coding-standard to v7.0.20

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
slevomat/coding-standard	require-dev	patch	7.0.19 -> 7.0.20

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Release Notes

slevomat/coding-standard

### [`v7.0.20`](https://togithub.com/slevomat/coding-standard/releases/7.0.20) [Compare Source](https://togithub.com/slevomat/coding-standard/compare/7.0.19...7.0.20) ## 🐛 Fixes - `SlevomatCodingStandard.TypeHints.ReturnTypeHint`: Improved - Type alias should not be reported as "missing traversable type hint specification" - `SlevomatCodingStandard.TypeHints.ParameterTypeHint`: Improved - Type alias should not be reported as "missing traversable type hint specification" - `SlevomatCodingStandard.TypeHints.PropertyTypeHint`: Improved - Type alias should not be reported as "missing traversable type hint specification" - `SlevomatCodingStandard.TypeHints.ReturnTypeHint`: It was not possible to suppress some errors - `SlevomatCodingStandard.Classes.ParentCallSpacing`: Fixed false positive

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