fix(lib): prevent filename collision

[jeertmans]

Apparently, ManimCE can produce two different animations with the same name (i.e., the same hash). As documented, ManimGL would anyway produce files with the same name, so this fix was needed.

Closes #428

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 79.30%. Comparing base (962ff2b) to head (19c74f6). Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #429      +/-   ##
==========================================
- Coverage   79.33%   79.30%   -0.04%     
==========================================
  Files          22       22              
  Lines        1815     1822       +7     
==========================================
+ Hits         1440     1445       +5     
- Misses        375      377       +2     

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