Update bit type

[Tigrov]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	yiisoft/db#860

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.28%. Comparing base (e4795a9) to head (70e09ac).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #353      +/-   ##
============================================
- Coverage     99.28%   99.28%   -0.01%     
+ Complexity      288      287       -1     
============================================
  Files            25       25              
  Lines           842      836       -6     
============================================
- Hits            836      830       -6     
  Misses            6        6              

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