minor #1211 Remove redundant mongodb/mongodb conflict from examples (OskarStark)

This PR was merged into the main branch.

Discussion
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 Remove redundant mongodb/mongodb conflict from examples

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

The conflict is already declared in the required packages symfony/ai-mongo-db-store and symfony/ai-mongo-db-message-store.

Commits
-------

e6d575b Remove redundant mongodb/mongodb conflict from examples

Author: OskarStark

examples/composer.json

@@ -138,9 +138,6 @@
         "phpstan/phpstan": "^2.1",
         "phpstan/phpstan-strict-rules": "^2.0"
     },
-    "conflict": {
-        "mongodb/mongodb": "<1.21"
-    },
     "minimum-stability": "dev",
     "autoload": {
         "psr-4": {