Bump Babylon.js from 9.0.0 to 9.3.4 (#1667)

## Summary

Bump Babylon.js from `9.0.0` to `9.3.4` across all `package.json` /
`package-lock.json` files under `Apps/`.

## Motivation

Recent CI runs (e.g. on #1666) show `Win32_x64_D3D11` intermittently
failing on the `Light Projection Texture` UnitTests case:

```
[Log] Running Light Projection Texture
[Log] First pixel off at 182856: Value: (51, 51, 53) - Expected: (46, 22, 16)
[Log] Pixel difference: 170840 pixels.
[Log] failed
##[error]Process completed with exit code -1.
```

Two upstream readiness bugs combine to produce this flake, and both need
to land to remove it:

- **BabylonJS/Babylon.js#18255** — "Fix material readiness to gate on
light texture readiness." Shipped in Babylon.js 9.3.2.
- **BabylonJS/Babylon.js#18355** — heightmap `CreateGroundFromHeightMap`
readiness (the async image load was not gated by
`addPendingData`/`removePendingData`, so `scene.isReady()` could return
true before the heightmap was uploaded). Shipped in Babylon.js 9.3.4.

Earlier 9.3.2 / 9.3.3 bumps on this branch picked up #18255 but the
flake persisted because the heightmap race (#18355) was still present.
Bumping to `^9.3.4` picks up both.

## Changes

- `Apps/package.json` + lockfile: bump `babylonjs`,
`babylonjs-gltf2interface`, `babylonjs-gui`, `babylonjs-loaders`,
`babylonjs-materials`, `babylonjs-serializers` to `^9.3.4`.
- `Apps/UnitTests/JavaScript/package.json`: bump `babylonjs`,
`babylonjs-materials`, `@babylonjs/core`, `@babylonjs/materials` to
`^9.3.4`.
- `Apps/PrecompiledShaderTest/JavaScript/package.json` + lockfile: bump
`@babylonjs/core` to `^9.3.4`.

No code changes — dependency bump only.

## Verification

CI on this PR is expected to go green on `Win32_x64_D3D11 Light
Projection Texture` where it was previously flaky. Validated out-of-band
on #1668 (monkey-patched 9.3.3 → 9.3.4 behavior) running LPT ×20 × 6
configs = 120/120 on Ubuntu_GCC_JSC.

---

[Created by Copilot on behalf of @bghgary]

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bghgary

Apps/PrecompiledShaderTest/JavaScript/package-lock.json

@@ -11,18 +11,17 @@
         "prepare:shaders": "tsx ./tools/prepareShaders.ts"
     },
     "license": "MIT",
-    "dependencies": {},
     "devDependencies": {
         "@babel/cli": "^7.28.3",
         "@babel/core": "^7.28.3",
         "@babel/preset-env": "^7.28.3",
-        "@babylonjs/core": "^9.0.0",
+        "@babylonjs/core": "^9.3.4",
         "@types/node": "^24.7.1",
         "rimraf": "^6.0.1",
+        "terser-webpack-plugin": "^5.3.10",
         "ts-loader": "^9.5.4",
         "tsx": "^4.20.6",
         "typescript": "^5.5.4",
-        "terser-webpack-plugin": "^5.3.10",
         "webpack": "^5.101.3",
         "webpack-cli": "^6.0.1"
     },

Apps/PrecompiledShaderTest/JavaScript/package.json

@@ -7,8 +7,8 @@
     "watch": "webpack -watch"
   },
   "dependencies": {
-    "babylonjs": "^9.0.0",
-    "babylonjs-materials": "^9.0.0",
+    "babylonjs": "^9.3.4",
+    "babylonjs-materials": "^9.3.4",
     "chai": "^5.2.0",
     "jsc-android": "^241213.1.0",
     "mocha": "^11.1.0",
@@ -27,8 +27,8 @@
     "@babel/preset-react": "^7.27.1",
     "@babel/preset-typescript": "^7.27.1",
     "@babel/runtime": "^7.28.2",
-    "@babylonjs/core": "^9.0.0",
-    "@babylonjs/materials": "^9.0.0",
+    "@babylonjs/core": "^9.3.4",
+    "@babylonjs/materials": "^9.3.4",
     "babel-loader": "^10.0.0",
     "buffer": "^6.0.3",
     "core-js": "^3.45.0",

Apps/UnitTests/JavaScript/package.json

@@ -9,12 +9,12 @@
     "getNightly": "node scripts/getNightly.js"
   },
   "dependencies": {
-    "babylonjs": "^9.0.0",
-    "babylonjs-gltf2interface": "^9.0.0",
-    "babylonjs-gui": "^9.0.0",
-    "babylonjs-loaders": "^9.0.0",
-    "babylonjs-materials": "^9.0.0",
-    "babylonjs-serializers": "^9.0.0",
+    "babylonjs": "^9.3.4",
+    "babylonjs-gltf2interface": "^9.3.4",
+    "babylonjs-gui": "^9.3.4",
+    "babylonjs-loaders": "^9.3.4",
+    "babylonjs-materials": "^9.3.4",
+    "babylonjs-serializers": "^9.3.4",
     "jsc-android": "^241213.1.0",
     "v8-android": "^7.8.2"
   }