Bump CLUSTER SHARDS command update version to 9.1.0

[hpatro]

Introduced in #2568 as part of 9.0

[hpatro]

@satheeshaGowda FYI

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.61%. Comparing base (0d500c2) to head (3eda9ef).
⚠️ Report is 1 commits behind head on unstable.

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable    #2729      +/-   ##
============================================
+ Coverage     72.59%   72.61%   +0.02%     
============================================
  Files           128      128              
  Lines         71277    71277              
============================================
+ Hits          51741    51759      +18     
+ Misses        19536    19518      -18     

Files with missing lines	Coverage Δ
src/commands.def	100.00% <ø> (ø)

... and 13 files with indirect coverage changes

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