Update version date when updating

[nickygerritsen]

I noticed that the version thingy I created didn't update the date when a version is updated. This fixes that.

[codecov]

Codecov Report

Merging #238 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #238   +/-   ##
=========================================
  Coverage     99.67%   99.67%           
- Complexity     1481     1483    +2     
=========================================
  Files           245      245           
  Lines          4318     4323    +5     
=========================================
+ Hits           4304     4309    +5     
  Misses           14       14           

Impacted Files	Coverage Δ	Complexity Δ
src/Entity/Organization/Package.php	100.00% <100.00%> (ø)	35.00 <0.00> (ø)
src/Entity/Organization/Package/Version.php	100.00% <100.00%> (ø)	11.00 <2.00> (+2.00)

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[akondas]

Thanks @nickygerritsen 🍻