Use -1 to indicate dynamically sized dimensions

[michaelosthege]

Strictly speaking the change of data type in the protobuf is bad practice, but the package is still in 0.x versions so there's that.

[codecov-commenter]

Codecov Report

Base: 95.79% // Head: 96.07% // Increases project coverage by +0.28% 🎉

Coverage data is based on head (0d6fa20) compared to base (6a75046).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   95.79%   96.07%   +0.28%     
==========================================
  Files           9        9              
  Lines         642      637       -5     
==========================================
- Hits          615      612       -3     
+ Misses         27       25       -2     

Impacted Files	Coverage Δ
mcbackend/__init__.py	77.77% <100.00%> (+6.34%)	⬆️
mcbackend/core.py	87.21% <100.00%> (ø)
mcbackend/meta.py	100.00% <100.00%> (ø)

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