WebGPURenderer: Fix uniform update tests

[sunag]

Description

This PR fixed a precision issue that had been detected for a while, the uniforms were always updated because the default numerical precision of JS is 64-bit, while the comparison buffer is 32-bit, which resulted in something like

console.log( new Float32Array( [ Math.PI ] )[ 0 ] === Math.PI ); // false

// instead of
console.log( [ Math.PI ][ 0 ] === Math.PI ) // true