minor #278 [MCP SDK] Remove rector/rector dependency (OskarStark)

This PR was merged into the main branch.

Discussion
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[MCP SDK] Remove rector/rector dependency

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Docs?         | no
| Issues        | --
| License       | MIT

Commits
-------

4afa3d5 [MCP SDK] Remove rector/rector dependency

Author: OskarStark

src/mcp-sdk/composer.json

@@ -22,7 +22,6 @@
         "phpstan/phpstan": "^2.1",
         "phpunit/phpunit": "^11.5",
         "symfony/console": "^6.4 || ^7.0",
-        "rector/rector": "^2.0",
         "psr/cache": "^3.0"
     },
     "suggest": {