Prepare v0.4.3 release

[pgguru]

Bump version number and cargo update prior to v0.4.3 release.

[aykut-bozkurt]

Can you add an empty sql update file like pg_parquet---.sql?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.89%. Comparing base (db16723) to head (144130f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   90.89%   90.89%           
=======================================
  Files          92       92           
  Lines       10431    10431           
=======================================
  Hits         9481     9481           
  Misses        950      950           

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