Update struggle-for-php/sfp-phpstan-psr-log requirement || ^0.21.0 (#569)

Updates the requirements on [struggle-for-php/sfp-phpstan-psr-log](https://github.com/struggle-for-php/sfp-phpstan-psr-log) to permit the latest version.
- [Release notes](https://github.com/struggle-for-php/sfp-phpstan-psr-log/releases)
- [Commits](struggle-for-php/sfp-phpstan-psr-log@0.20.0...0.21.0)

---
updated-dependencies:
- dependency-name: struggle-for-php/sfp-phpstan-psr-log
  dependency-type: direct:development
...

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Author: dependabot[bot]

composer.json

@@ -86,7 +86,7 @@
         "spomky-labs/aes-key-wrap": "^7.0",
         "staabm/phpstan-dba": "^0.2.79",
         "staabm/phpstan-todo-by": "^0.1.25",
-        "struggle-for-php/sfp-phpstan-psr-log": "^0.20.0",
+        "struggle-for-php/sfp-phpstan-psr-log": "^0.20.0 || ^0.21.0",
         "symfony/browser-kit": "^7.0",
         "symfony/http-client": "^7.0",
         "symfony/clock": "^7.0",