Add xz to conda host dependencies

[charlesbluca]

This should resolve the overlink warnings we get during the linux-64 builds:

WARNING (dask-sql,lib/python3.10/site-packages/dask_planner/rust.cpython-310-x86_64-linux-gnu.so): Needed DSO lib/liblzma.so.5 found in ['xz']
WARNING (dask-sql,lib/python3.10/site-packages/dask_planner/rust.cpython-310-x86_64-linux-gnu.so): .. but ['xz'] not in reqs/run, (i.e. it is overlinking) (likely) or a missing dependency (less likely)

I've also added the --error-overlinking flag to the builds which should catch any potential overlink issues moving forward.

[codecov-commenter]

Codecov Report

Merging #1202 (a575d5c) into main (2c5a492) will increase coverage by 0.10%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main    #1202      +/-   ##
==========================================
+ Coverage   82.13%   82.23%   +0.10%     
==========================================
  Files          78       78              
  Lines        4572     4572              
  Branches      849      849              
==========================================
+ Hits         3755     3760       +5     
+ Misses        634      625       -9     
- Partials      183      187       +4     

see 1 file with indirect coverage changes

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[jakirkham]

Thanks Charles! 🙏