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GH-36599: [MATLAB] Bump libmexclass version to 3465900 (#36600)



### Rationale for this change

We recently made some improvements to `libmexclass` that include creating a class named `libmexclass.proxy.Identifier` which represents proxy ids. This class will be helpful when we create `arrowy.array.Array` objects from existing proxy ids, which used to be represented as scalar `uint64` values.

### What changes are included in this PR?

1. Bumps the libmexclass version the MATLAB Interface depends on to [#3465900](https://github.com/mathworks/libmexclass/commit/3465900f8fdec5b23f29eab3ee810a680294a016) 

### Are these changes tested?

No tests needed.

### Are there any user-facing changes?

No.

* Closes: #36599

Authored-by: Sarah Gilmore <sgilmore@mathworks.com>
Signed-off-by: Kevin Gurney <kgurney@mathworks.com>