Update dependency psr/http-message to v2

| datasource | package          | from  | to  |
| ---------- | ---------------- | ----- | --- |
| packagist  | psr/http-message | 1.0.1 | 2.0 |

Author: renovate[bot]

composer.json

@@ -16,7 +16,7 @@
         "lcobucci/content-negotiation-middleware": "^3.1",
         "middlewares/negotiation": "^2.1",
         "psr/http-factory": "^1.0.1",
-        "psr/http-message": "^1.0.1",
+        "psr/http-message": "^2.0.0",
         "psr/http-server-handler": "^1.0.1",
         "psr/http-server-middleware": "^1.0.1"
     },