Update TypeScript from 5.7 to 5.9

[docEdub]

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Reviewer - this PR has made changes to one or more package.json files.

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[docEdub]

Testing this change with older versions of TypeScript shows it works fine for TS 5.7.3 and newer, but 5.6.3 and older has the following errors:

    packages/public/@babylonjs/core/Engines/thinNativeEngine.d.ts(533,135): error TS2315: Type 'ArrayBufferView' is not generic.
    packages/public/@babylonjs/core/Meshes/GaussianSplatting/gaussianSplattingMesh.d.ts(344,13): error TS2315: Type 'Uint8Array' is not generic.
    packages/public/@babylonjs/core/Meshes/GaussianSplatting/gaussianSplattingMesh.d.ts(372,13): error TS2315: Type 'Uint8Array' is not generic.

[sebavan]

Can we try to remove the " as " whenever possible by changing the targetted types ?