bump slab from 0.4.10 to 0.4.11

[alexpyattaev]

Problem

• Bugfix in slab crate https://github.com/tokio-rs/slab/pull/152/files

Summary of Changes

• bump the version

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.3%. Comparing base (407c9f1) to head (2599bc5).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master    #7467     +/-   ##
=========================================
- Coverage    83.3%    83.3%   -0.1%     
=========================================
  Files         800      801      +1     
  Lines      362736   362772     +36     
=========================================
- Hits       302250   302230     -20     
- Misses      60486    60542     +56     

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