chore: missing pixel perfect package for unity 6

Author: nattb8

sample-unity6/Packages/manifest.json

@@ -5,6 +5,7 @@
     "com.immutable.api.zkevm": "file:../../src/Packages/ZkEvmApi",
     "com.immutable.marketplace": "file:../../src/Packages/Marketplace",
     "com.immutable.passport": "file:../../src/Packages/Passport",
+    "com.unity.2d.pixel-perfect": "5.1.1",
     "com.unity.collab-proxy": "2.9.3",
     "com.unity.feature.2d": "2.0.1",
     "com.unity.ide.rider": "3.0.38",

sample-unity6/Packages/packages-lock.json

@@ -82,10 +82,12 @@
       "url": "https://packages.unity.com"
     },
     "com.unity.2d.pixel-perfect": {
-      "version": "5.0.3",
-      "depth": 1,
+      "version": "5.1.1",
+      "depth": 0,
       "source": "registry",
-      "dependencies": {},
+      "dependencies": {
+        "com.unity.modules.imgui": "1.0.0"
+      },
       "url": "https://packages.unity.com"
     },
     "com.unity.2d.psdimporter": {