update to install most recent working q2 version

[gregcaporaso]

Tested with 2023.02 and got the following error from mamba:

$ mamba create -yn q2-shotgun \
>   -c https://packages.qiime2.org/qiime2/2023.2/tested \
>   -c bioconda -c conda-forge -c default q2-assembly q2cli
...
Encountered problems while solving:
  - nothing provides requested q2-assembly

[codecov[bot]]

Codecov Report

Merging #40 (70921bd) into main (e86efbb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #40   +/-   ##
=======================================
  Coverage   98.67%   98.67%           
=======================================
  Files          25       25           
  Lines        1284     1284           
=======================================
  Hits         1267     1267           
  Misses         17       17           

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