Update laminas/laminas-diactoros requirement from ^2.20 to ^3.2 (#24)

Updates the requirements on [laminas/laminas-diactoros](https://github.com/laminas/laminas-diactoros) to permit the latest version.
- [Release notes](https://github.com/laminas/laminas-diactoros/releases)
- [Commits](laminas/laminas-diactoros@2.20.0...3.2.0)

---
updated-dependencies:
- dependency-name: laminas/laminas-diactoros
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -35,7 +35,7 @@
     "infection/infection": "~0.25|~0.27",
     "juliangut/easy-coding-standard-config": "^1.12",
     "juliangut/phpstan-config": "^1.1",
-    "laminas/laminas-diactoros": "^2.20",
+    "laminas/laminas-diactoros": "^3.2",
     "mikey179/vfsstream": "^1.6",
     "overtrue/phplint": "^9.0",
     "phpcompatibility/php-compatibility": "^9.3",