Fix type hints in resource resolver

[pmrv]

Fixes #51

[github-actions]

👈 Launch a binder notebook on branch pyiron/pyiron_snippets/typeres

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.10%. Comparing base (1fe7e8b) to head (f43b528).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   95.10%   95.10%           
=======================================
  Files          13       13           
  Lines         552      552           
=======================================
  Hits          525      525           
  Misses         27       27           

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