Allow Nemo 0.49

[lgoettgens]

The only "breaking" change is the printing of algebraic_closure(QQ), which should have no effect here.
@ederc could you please prepare a release with this so we can proceed in Oscar?

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.29%. Comparing base (6719e08) to head (d8e6dbe).
Report is 378 commits behind head on main.

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HEAD has 2 uploads less than BASE

Flag	BASE (6719e08)	HEAD (d8e6dbe)
	6	4

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #95      +/-   ##
==========================================
- Coverage   95.08%   85.29%   -9.80%     
==========================================
  Files          15       24       +9     
  Lines        1262     2475    +1213     
==========================================
+ Hits         1200     2111     +911     
- Misses         62      364     +302     

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[thofma]

can you bump the version to 0.8.3 right here?