Update psr/container requirement from ^1.0 to ^2.0

Updates the requirements on [psr/container](https://github.com/php-fig/container) to permit the latest version.
- [Release notes](https://github.com/php-fig/container/releases)
- [Commits](php-fig/container@1.0.0...2.0.2)

---
updated-dependencies:
- dependency-name: psr/container
  dependency-type: direct:production
...

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

composer.json

@@ -17,7 +17,7 @@
         "ext-xml": "*",
         "psr/http-message": "^1.0",
         "psr/http-factory": "^1.0",
-        "psr/container": "^1.0",
+        "psr/container": "^2.0",
         "psr/http-server-middleware": "^1.0",
         "psr/http-server-handler": "^1.0",
         "psr/http-client": "^1.0",