fix(release): Add missing var to post-release script

[iker-barriocanal]

Adds a missing and required variable to scripts/post-release.sh, run by Craft after a release.

#skip-changelog

[codecov-commenter]

Codecov Report

Merging #1587 (786f8bb) into main (aca78d9) will increase coverage by 0.02%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main    #1587      +/-   ##
============================================
+ Coverage     75.99%   76.02%   +0.02%     
  Complexity     1974     1974              
============================================
  Files           198      198              
  Lines          6837     6837              
  Branches        680      680              
============================================
+ Hits           5196     5198       +2     
+ Misses         1307     1306       -1     
+ Partials        334      333       -1     

Impacted Files	Coverage Δ
...n/java/io/sentry/transport/ReusableCountLatch.java	88.23% <0.00%> (+5.88%)	⬆️

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