tests(event): fix missing hash update

[jansegre]

Motivation

This inconsistency was noticed when testing an upgrade to Python 3.12, it's unclear why the test was passing though.

Acceptance Criteria

• Make sure block's hash is updated after altering its parents.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (abbd054) 85.26% compared to head (109ffc7) 85.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #921      +/-   ##
==========================================
+ Coverage   85.26%   85.33%   +0.07%     
==========================================
  Files         284      284              
  Lines       22330    22332       +2     
  Branches     3367     3368       +1     
==========================================
+ Hits        19039    19058      +19     
+ Misses       2616     2606      -10     
+ Partials      675      668       -7     

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