Bump monolog/monolog from 2.5.0 to 2.6.0 (#124)

Bumps [monolog/monolog](https://github.com/Seldaek/monolog) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/Seldaek/monolog/releases)
- [Changelog](https://github.com/Seldaek/monolog/blob/main/CHANGELOG.md)
- [Commits](Seldaek/monolog@2.5.0...2.6.0)

---
updated-dependencies:
- dependency-name: monolog/monolog
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

composer.json

@@ -18,7 +18,7 @@
     "ext-json": "*",
     "ext-xml": "*",
     "predis/predis": "^1.1",
-    "monolog/monolog": "2.5.0",
+    "monolog/monolog": "2.6.0",
     "macbre/monolog-utils": "^2.1",
     "tedivm/jshrink": "^1.2"
   },