Issue #3426100: Ignore "Unsafe usage of new static()" errors from phpstan, as recommended

https://www.drupal.org/docs/develop/development-tools/phpstan/handling-unsafe-usage-of-new-static

This usage of "new static()" is a Drupal best practice.

phpstan.neon

+includes:
+  - phar://phpstan.phar/conf/bleedingEdge.neon
+
+parameters:
+  level: 1
+  reportUnmatchedIgnoredErrors: false
+  ignoreErrors:
+    # new static() is a best practice in Drupal, so we cannot fix that.
+    - "#^Unsafe usage of new static#"