build: Track gpu.js from git until 2.19.7 is on npm

The string kernel this app must use needs createKernel to be typed for
a string source, which lands in gpu.js 2.19.7. Both gpu.js and
@gpujs/expo-gl point at git until their releases are published; switch
both to version ranges afterwards.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: fuzzie360

package-lock.json

@@ -16,7 +16,7 @@
     "expo": "~57.0.8",
     "expo-gl": "~57.0.2",
     "expo-status-bar": "~57.0.1",
-    "gpu.js": "^2.19.6",
+    "gpu.js": "github:gpujs/gpu.js#develop",
     "react": "19.2.3",
     "react-native": "0.86.0"
   },