Bindings: limit fix_dynamic_attr_dealloc to pybind11 3.0.3, since the problem was fixed upstream

Yury Matveevrequested to merge
limit-memory-deallocator-patch-to-pybind11-3-0-3 into develop

Closes #751 (closed)

New pybind11 appeared yesterday, with fix of dynamic attribute deallocation: https://github.com/pybind/pybind11/releases/tag/v3.0.3

So we limit our patch to this version to exclude doulbe-patching

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