Deprecate Cursor.Error access

[methane]

Fix #1111.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.06 ⚠️

Comparison is base (bd3bd01) 86.16% compared to head (10f5080) 86.10%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1117      +/-   ##
==========================================
- Coverage   86.16%   86.10%   -0.06%     
==========================================
  Files          17       17              
  Lines        2435     2426       -9     
  Branches      256      256              
==========================================
- Hits         2098     2089       -9     
  Misses        248      248              
  Partials       89       89              

Impacted Files	Coverage Δ
pymysql/cursors.py	82.96% <100.00%> (-0.55%)	⬇️

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