Mark return value of execute prepared statement as discardable

[lovetodream]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.03%. Comparing base (ad98697) to head (b6c033b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
- Coverage   88.03%   88.03%   -0.01%     
==========================================
  Files         150      150              
  Lines       21076    21076              
==========================================
- Hits        18555    18554       -1     
- Misses       2521     2522       +1     

Files with missing lines	Coverage Δ
...ources/OracleNIO/Connection/OracleConnection.swift	94.06% <ø> (ø)

... and 1 file with indirect coverage changes