Update manifest.json

Author: sebastienlagarde

TestProjects/HDRP_Tests/Packages/manifest.json

@@ -12,7 +12,6 @@
     "com.unity.testing.hdrp": "file:../../../com.unity.testing.hdrp",
     "com.unity.ugui": "1.0.0",
     "com.unity.visualeffectgraph": "file:../../../com.unity.visualeffectgraph",
-    "com.unity.xr.legacyinputhelpers": "2.1.2",
     "com.unity.modules.ai": "1.0.0",
     "com.unity.modules.androidjni": "1.0.0",
     "com.unity.modules.animation": "1.0.0",