Always set MULTI_RESULTS flag

[methane]

No description provided.

[codecov]

Codecov Report

Merging #515 (3ebd77e) into main (16d139c) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #515      +/-   ##
==========================================
- Coverage   85.79%   85.71%   -0.08%     
==========================================
  Files           6        6              
  Lines         542      539       -3     
==========================================
- Hits          465      462       -3     
  Misses         77       77              

Impacted Files	Coverage Δ
MySQLdb/connections.py	86.71% <100.00%> (-0.31%)	⬇️

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