Update roave/infection-static-analysis-plugin requirement (#16)

Updates the requirements on [roave/infection-static-analysis-plugin](https://github.com/Roave/infection-static-analysis-plugin) to permit the latest version.
- [Release notes](https://github.com/Roave/infection-static-analysis-plugin/releases)
- [Commits](Roave/infection-static-analysis-plugin@1.5.0...1.6.0)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -24,7 +24,7 @@
     },
     "require-dev": {
         "phpunit/phpunit": "^9.4",
-        "roave/infection-static-analysis-plugin": "^1.5",
+        "roave/infection-static-analysis-plugin": "^1.6",
         "spatie/phpunit-watcher": "^1.23",
         "vimeo/psalm": "^4.3"
     },