Update ekino/phpstan-banned-code requirement from ^1.0 to ^1.0 || ^2.0 (#582)

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
...

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Author: dependabot[bot]

composer.json

@@ -64,7 +64,7 @@
         "ext-curl": "*",
         "ext-gmp": "*",
         "ext-sodium": "*",
-        "ekino/phpstan-banned-code": "^1.0",
+        "ekino/phpstan-banned-code": "^1.0 || ^2.0",
         "ergebnis/phpunit-slow-test-detector": "^2.14",
         "infection/infection": "^0.29",
         "matthiasnoback/symfony-config-test": "5.1.x-dev",