Update spatie/robots-txt requirement from ^1.0 to ^2.0

Updates the requirements on [spatie/robots-txt](https://github.com/spatie/robots-txt) to permit the latest version.
- [Release notes](https://github.com/spatie/robots-txt/releases)
- [Changelog](https://github.com/spatie/robots-txt/blob/main/CHANGELOG.md)
- [Commits](spatie/robots-txt@1.0.0...2.0.2)

---
updated-dependencies:
- dependency-name: spatie/robots-txt
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -23,7 +23,7 @@
         "symfony/finder": "^3.0.0||^4.0.0||^5.0.0||^6.0",
         "symfony/event-dispatcher": "^4.0.0||^5.0.0||^6.0",
         "vdb/uri": "^0.3.2",
-        "spatie/robots-txt": "^1.0",
+        "spatie/robots-txt": "^2.0",
         "phan/phan": "^4.0||^5.0"
     },
     "require-dev": {