Fix composer requirements

Author: kelunik

composer.json

@@ -28,6 +28,7 @@
         "php": ">=8.1",
         "amphp/amp": "^3",
         "amphp/byte-stream": "^2",
+        "amphp/cache": "^2",
         "amphp/parser": "^1",
         "amphp/pipeline": "^1",
         "amphp/process": "^2",