composer: update guzzlehttp/psr7 requirement from ^1.8 || ^2.4 to ^2.12.3

Updates the requirements on [guzzlehttp/psr7](https://github.com/guzzle/psr7) to permit the latest version.
- [Release notes](https://github.com/guzzle/psr7/releases)
- [Changelog](https://github.com/guzzle/psr7/blob/2.12/CHANGELOG.md)
- [Commits](https://github.com/guzzle/psr7/commits/2.12.3)

---
updated-dependencies:
- dependency-name: guzzlehttp/psr7
  dependency-version: 2.12.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -25,7 +25,7 @@
         "ext-json": "*",
         "ext-mbstring": "*",
         "guzzlehttp/guzzle": "^7.9 || ^7.10",
-        "guzzlehttp/psr7": "^1.8 || ^2.4",
+        "guzzlehttp/psr7": "^2.12.3",
         "vitexsoftware/ease-core": "^1.49"
     },
     "require-dev": {