[HINTY] Modernise typing in scapy/ansmachine.py

[MarcoGorelli]

Checklist:

• If you are new to Scapy: I have checked CONTRIBUTING.md (esp. section submitting-pull-requests)
• I squashed commits belonging together
• I added unit tests or explained why they are not relevant
• I executed the regression tests (using cd test && ./run_tests or tox)
• If the PR is still not finished, please create a Draft Pull Request

fixes #4649

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.72%. Comparing base (f998c63) to head (2e5283e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4650      +/-   ##
==========================================
- Coverage   81.42%   78.72%   -2.70%     
==========================================
  Files         359      334      -25     
  Lines       86237    81039    -5198     
==========================================
- Hits        70215    63796    -6419     
- Misses      16022    17243    +1221     

Files with missing lines	Coverage Δ
scapy/ansmachine.py	66.84% <100.00%> (-1.09%)	⬇️

... and 286 files with indirect coverage changes

[gpotter2]

We no longer support Python 2, so this is not wanted.

[MarcoGorelli]

Thanks for your review!

This is still necessary if you want to use modern type hints such as dict[str] instead of Dict[str] https://peps.python.org/pep-0585/

I can revert to Dict if you prefer, it just requires an extra from typing import Dict