chore(deps-dev): update slevomat/coding-standard requirement from ^6.3 to ^8.6

[dependabot[bot]]

Updates the requirements on slevomat/coding-standard to permit the latest version.

Release notes

Sourced from slevomat/coding-standard's releases.

8.6.0

🆕 New sniffs

• Added SlevomatCodingStandard.Attributes.AttributesOrder
• Added SlevomatCodingStandard.Attributes.AttributeAndTargetSpacing
• Added SlevomatCodingStandard.Attributes.DisallowMultipleAttributesPerLine
• Added SlevomatCodingStandard.Attributes.DisallowAttributesJoining (thanks to @​michnovka)
• Added SlevomatCodingStandard.Attributes.RequireAttributeAfterDocComment

🔧 Improvements

• Support of phpstan/phpdoc-parser 1.11.0
• Support for @phpstan-self-out/@phpstan-this-out
• Support for @param-out annotation`
• Support for @template with default value
• Add dev Composer keyword (thanks to @​GaryJones)

🐛 Fixes

• Improved detection of references in double quotes strings

Commits

• d4175d8 Cleanup
• ac214c2 Added TokenHelper::findLastTokenOnPreviousLine()
• 48d18ac Cleanup
• ddaffda Added TokenHelper::findNextNonWhitespace() and findPreviousNonWhitespace()
• ea56749 Added FixerHelper::removeBetween() and removeBetweenIncluding()
• e0721b0 Fix
• 0375070 Cleanup
• 5cf6375 Better method names in FixerHelper
• e3e3524 FixerHelper should work with modified tokens
• d494cda SlevomatCodingStandard.Attributes.DisallowAttributeJoining renamed to Slevoma...
• Additional commits viewable in compare view

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Superseded by #112.