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

@@ -56,7 +56,7 @@
     "require-dev": {
         "ext-gmp": "*",
         "ext-openssl": "*",
-        "ekino/phpstan-banned-code": "^1.0",
+        "ekino/phpstan-banned-code": "^1.0 || ^2.0",
         "infection/infection": "^0.28",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpstan/extension-installer": "^1.3",