Update pyproject.toml for 1.1.6

[ori-kron-wis]

This is for anndata to work with mudata for scvi-tools 1.1.x most recent release
for scvi >=1.2.x we will no longer support python 3.9 and this constraint will be redundant

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.88%. Comparing base (07c3a12) to head (0da95e8).
Report is 1 commits behind head on 1.1.x.

Additional details and impacted files

@@           Coverage Diff           @@
##            1.1.x    #2971   +/-   ##
=======================================
  Coverage   86.88%   86.88%           
=======================================
  Files         155      155           
  Lines       12897    12898    +1     
=======================================
+ Hits        11205    11207    +2     
+ Misses       1692     1691    -1     

see 3 files with indirect coverage changes