upgrade to unity 6.1

Assets/HurricaneVR/TechDemo/Materials/BulletTrail.mat

@@ -1,18 +1,5 @@
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@@ -25,7 +12,6 @@ Material:
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   m_ModifiedSerializedProperties: 0
   m_ValidKeywords:
-  - _EMISSION
   - _SURFACE_TYPE_TRANSPARENT
   m_InvalidKeywords:
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@@ -138,3 +124,17 @@ Material:
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     - _SpecColor: {r: 0.2, g: 0.2, b: 0.2, a: 1}
   m_BuildTextureStacks: []
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