Updated manifest and water submodule(before merging)

Packages/manifest.json

     "com.unity.mathematics": "0.0.12-preview.10",
     "com.unity.package-manager-ui": "2.0.0-preview.3",
     "com.unity.purchasing": "2.0.1",
-    "com.unity.render-pipelines.lightweight": "3.0.0-preview",
+    "com.unity.render-pipelines.lightweight": "3.1.0-preview",
     "com.unity.textmeshpro": "1.2.4",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.animation": "1.0.0",