Update dependency psr/http-message to v2

| datasource | package          | from | to  |
| ---------- | ---------------- | ---- | --- |
| packagist  | psr/http-message | 1.1  | 2.0 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

composer.json

@@ -40,7 +40,7 @@
         "mezzio/mezzio-authentication": "^1.0",
         "psr/container": "^1.0 || ^2.0",
         "psr/http-factory": "^1.0",
-        "psr/http-message": "^1.0.1",
+        "psr/http-message": "^1.0.1 || ^2.0.0",
         "psr/http-server-middleware": "^1.0",
         "webmozart/assert": "^1.10"
     },