Update monolog/monolog requirement from ^1.26.1 to ^2.8.0

Updates the requirements on [monolog/monolog](https://github.com/Seldaek/monolog) to permit the latest version.
- [Release notes](https://github.com/Seldaek/monolog/releases)
- [Changelog](https://github.com/Seldaek/monolog/blob/main/CHANGELOG.md)
- [Commits](Seldaek/monolog@1.26.1...2.8.0)

---
updated-dependencies:
- dependency-name: monolog/monolog
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -55,7 +55,7 @@
     "require-dev": {
         "doctrine/annotations": "^1.13",
         "doctrine/orm": "^2.5",
-        "monolog/monolog": "^1.26.1",
+        "monolog/monolog": "^2.8.0",
         "phpstan/extension-installer": "^1.0",
         "phpstan/phpstan": "1.8.4",
         "phpstan/phpstan-phpunit": "^1.0",