More weakref fixes

[rozyczko]

Some callers iterate over __type_dict while other threads or weakref finalizers may modify it. Creating a list snapshot (with a retry loop) prevents RuntimeError: dictionary changed size during iteration.

This should FINALLY get rid of this pesky issue.

[github-actions]

This pull request does not contain a valid label. Please add one of the following labels: ['[scope] bug', '[scope] enhancement', '[scope] documentation', '[scope] significant', '[scope] maintenance']

[codecov]

Codecov Report

❌ Patch coverage is 84.61538% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.11%. Comparing base (bd10653) to head (03631c2).

Files with missing lines	Patch %	Lines
src/easyscience/global_object/map.py	84.61%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #198      +/-   ##
===========================================
- Coverage    81.15%   81.11%   -0.05%     
===========================================
  Files           52       52              
  Lines         4267     4279      +12     
  Branches       740      740              
===========================================
+ Hits          3463     3471       +8     
- Misses         624      628       +4     
  Partials       180      180              

Flag	Coverage Δ
unittests	81.11% <84.61%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/easyscience/global_object/map.py	95.16% <84.61%> (-1.76%)	⬇️