Ensure that MurmurHash3_64.update handles ArrayBuffer input correctly, to avoid hash-collisions (issue 12533)

Different fonts incorrectly end up with *identical* hashes, despite having different /ToUnicode data.
The issue, and it's very interesting that we've apparently not seen it before, appears to be caused by the fact that different /ToUnicode entries share the *same* underlying `ArrayBuffer`, which thus becomes problematic at the `const dataUint32 = new Uint32Array(data.buffer, 0, blockCounts);` line. The simplest solution thus seem to be to just *copy* the input, when it's an `ArrayBuffer`, rather than using it as-is. (Note that if we'd stringified the input, when calling `MurmurHash3_64.update`, the issue would also have been fixed. In this case, we're already creating an unique TypedArray.)

src/core/murmurhash3.js

@@ -45,7 +45,7 @@ class MurmurHash3_64 {
         }
       }
     } else if (isArrayBuffer(input)) {
-      data = input;
+      data = input.slice();
       length = data.byteLength;
     } else {
       throw new Error(