update cinemachine (#185)

Author: kennytann

Packages/manifest.json

@@ -3,7 +3,7 @@
     "com.unity.2d.sprite": "1.0.0",
     "com.unity.addressables": "1.19.11",
     "com.unity.burst": "1.4.11",
-    "com.unity.cinemachine": "2.6.11",
+    "com.unity.cinemachine": "2.9.1",
     "com.unity.ide.rider": "2.0.7",
     "com.unity.inputsystem": "1.1.1",
     "com.unity.mathematics": "1.2.5",