Support for Python 3.10

[RobPasMue]

Description of the feature

Apparently, pydpf-post is not supported on Python 3.10. On the https://github.com/pyansys/pyansys-landing repository (the PyAnsys metapackage project), we are working on supporting all Python versions from 3.7 onwards. Is there a specific reason for this not to be possible with pydpf-post?

Steps for implementing the feature

Try supporting Python 3.10. Investigate problematic requirements and needs.

Useful links and references

No response

[PProfizi]

To support Python 3.10, the requirement on vtk<9.1.0 must be suppressed, as can be seen here.
When deleting the requirement on vtk<9.1.0, we obtain these errors.
See #107 for solving of the vtk limitations.
If further work is required for Python 3.10 effective support, it will be dealt with here.