Ignore cargo dist created workflows in rennovate.

[jsuereth]

This should clean up the PR queue of unmergable things.

We still need to figure out how to get cargo-dist to auto-upgrade workflows. Debating moving off cargo dist as not providing enough hooks / features with other github utilities.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.5%. Comparing base (1f42e8c) to head (570e08a).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #1067     +/-   ##
=======================================
+ Coverage   79.3%   79.5%   +0.2%     
=======================================
  Files         98      98             
  Lines       7318    7405     +87     
=======================================
+ Hits        5806    5892     +86     
- Misses      1512    1513      +1     

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