Update infection/infection requirement from ^0.15.3 to ^0.20.2

Created by: dependabot[bot]

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

Release notes

Sourced from infection/infection's releases.

Allow to set both global settings in config file at the same time

Fixed:

• Both global-ignore and global-ignoreSourceCodeByRegex cannot be set in infection.json file at the same time infection/infection#1433

Commits

• 6035c15 #1433 Allow to set both global settings in config file at the same time (#1434)
• 59a7a37 Check ignoreSourceCodeByRegex and global-ignoreSourceCodeByRegex config optio...
• 84aa944 Fix issue with order of keys in the config array (#1410)
• 735506c Update changelog for 0.20.0
• bef65fc Add github logger to be able to use Annotations on GitHub Actions (#1368)
• 2de4eaf Implement UnwrapSubstr mutator (#1400)
• 015fc46 Implement UnwrapStrRev mutator (#1399)
• 1b47e2e Implement UnwrapRtrim mutator (#1396)
• e6750b0 Add phpstan/phpstan-strict-rules, add all errors to baseline files (#1393)
• 440ffa5 Implement UnwrapStrIreplace mutator (#1397)
• Additional commits viewable in compare view

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