Removed memory session type (#3245)

Author: mnocon

code_samples/mcp/mcp.matrix.yaml

@@ -11,7 +11,7 @@ ibexa:
                         - Ibexa\Mcp\Tool\SeoTools
                     discovery_cache: <cache_pool_service>
                     session:
-                        type: <psr16|file|memory>
+                        type: <psr16|file>
                         # Session options…
                 mcp_psr16:
                     discovery_cache: cache.redis.mcp