Update paragonie/sodium_compat requirement from ^1.20 to ^1.20 || ^2.0 (#565)

Updates the requirements on [paragonie/sodium_compat](https://github.com/paragonie/sodium_compat) to permit the latest version.
- [Release notes](https://github.com/paragonie/sodium_compat/releases)
- [Commits](paragonie/sodium_compat@v1.20.0...v2.0.1)

---
updated-dependencies:
- dependency-name: paragonie/sodium_compat
  dependency-type: direct:development
...

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Author: dependabot[bot]

composer.json

@@ -69,7 +69,7 @@
         "ergebnis/phpunit-slow-test-detector": "^2.14",
         "infection/infection": "^0.28",
         "matthiasnoback/symfony-config-test": "^5.0",
-        "paragonie/sodium_compat": "^1.20",
+        "paragonie/sodium_compat": "^1.20 || ^2.0",
         "php-parallel-lint/php-parallel-lint": "^1.3",
         "phpbench/phpbench": "^1.2",
         "phpstan/extension-installer": "^1.3",