Fix Sentinal typo

[kit1980]

No description provided.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (de57f7c) 90.92% compared to head (2ccc905) 90.92%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #948   +/-   ##
=======================================
  Coverage   90.92%   90.92%           
=======================================
  Files         254      254           
  Lines       25937    25937           
=======================================
  Hits        23584    23584           
  Misses       2353     2353           

Impacted Files	Coverage Δ
libcst/_nodes/base.py	95.48% <0.00%> (ø)

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[zsol]

Thanks!