Update infection/infection requirement from ^0.15.3 to ^0.19.2

Created by: dependabot[bot]

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

Release notes

Sourced from infection/infection's releases.

Fix issues with JSON schema

Fixed:

• Call to undefined function get_debug_type() when configuration is invalid infection/infection#1384

Commits

• d1e4b90 Add ignoreSourceCodeByRegex key for custom mutator definitions (#1385)
• 46c17a7 Ensure Mutator::mutate() is mutations-free (#1382)
• e28e9ed Add changelog for 0.19.0 release
• 3119045 Introduce XmlConfigurationVersionProvider (#1378)
• a209c95 Trigger Travis CI deploy stage only for tagged builds (#1379)
• 78758c2 Refrain from adding filter tags if there are existing new-style coverage / in...
• 0db4bce Request coverage reports with command line args (#1375)
• cc299b1 Integration group annotation does not take comments (#1376)
• 507492b Fix spelling in console output (#1335)
• 69f5243 Limit Travi CI builds to .phar, which isn't tested on GH (#1373)
• Additional commits viewable in compare view

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