Update infection/infection requirement from ^0.15.3 to ^0.18.2

Created by: dependabot[bot]

Updates the requirements on infection/infection to permit the latest version.

Release notes

Sourced from infection/infection's releases.

Bump PHP-Parser

Changed:

• Bump PHP-Parser (for 0.18) #1359

Commits

• 05685f8 Bump PHP-Parser (for 0.18) (#1359)
• 7eb647d ArrayItemRemoval should not mutate lists (#1358)
• ddea14c Add changelog for 0.18.0 release
• 6c66bee Improve CI caching situation (#1339)
• 7eec259 Check the length of schema node before using its values (#1338)
• 2679bf3 Ensure Infection runs on PHP 8 (#1309)
• ee40e43 Add an ability to ignore Mutators for source code line(s) by regular expressi...
• d6bd395 Dedicated static function to parse out mutator name (#1331)
• ea3c0b4 Quick GitHub Actions testing workflow (#1333)
• 6f21b55 Avoid decorating mutators with IgnoreMutator unless required (#1332)
• Additional commits viewable in compare view

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