Update ekino/phpstan-banned-code requirement from ^1.0 to ^1.0 || ^2.0

Updates the requirements on [ekino/phpstan-banned-code](https://github.com/ekino/phpstan-banned-code) to permit the latest version.
- [Release notes](https://github.com/ekino/phpstan-banned-code/releases)
- [Changelog](https://github.com/ekino/phpstan-banned-code/blob/master/CHANGELOG.md)
- [Commits](ekino/phpstan-banned-code@v1.0.0...v2.0.0)

---
updated-dependencies:
- dependency-name: ekino/phpstan-banned-code
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -23,7 +23,7 @@
         "symfony/deprecation-contracts": "^3.2"
     },
     "require-dev": {
-        "ekino/phpstan-banned-code": "^1.0",
+        "ekino/phpstan-banned-code": "^1.0 || ^2.0",
         "infection/infection": "^0.26|^0.27|^0.28|^0.29",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpstan/phpstan": "^1.0",