Convert UUID_BINARY in PK during update

[mringler]

Fixes propelorm#1914 (comment).

I have also changed the UuidConverter, so that it handles null values. The initial idea was to be strict with the type, but it is not robust and lead to ugly code, where the null check has to be performed manually every time.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (bf3ebb5) 89.27% compared to head (6b29c6d) 89.35%.
Report is 6 commits behind head on main.

Files	Patch %	Lines
src/Propel/Generator/Builder/Om/ObjectBuilder.php	90.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main       #4      +/-   ##
============================================
+ Coverage     89.27%   89.35%   +0.07%     
- Complexity     8049     8062      +13     
============================================
  Files           232      232              
  Lines         24519    24554      +35     
============================================
+ Hits          21889    21939      +50     
+ Misses         2630     2615      -15     

Flag	Coverage Δ
5-max	89.35% <93.75%> (+0.07%)	⬆️
7.4	89.35% <93.75%> (+0.07%)	⬆️
agnostic	67.40% <68.75%> (-0.07%)	⬇️
mysql	69.94% <87.50%> (+0.13%)	⬆️
pgsql	69.90% <87.50%> (+0.06%)	⬆️
sqlite	67.87% <87.50%> (+0.07%)	⬆️

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