return type of method is corrected.

[MrWasimAbbasi]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	code readability increased

[what-the-diff]

PR Summary

• Modification of testSerialized Method in AbstractConnectionTest.php
  The testSerialized method has been updated to define the kind of value it returns. From now on, it's made clear that this function does not return any value, enhancing the predictability and readability of our codebase.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.51%. Comparing base (71c9f37) to head (170f1a0).
Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #814      +/-   ##
============================================
- Coverage     99.55%   99.51%   -0.04%     
  Complexity     1277     1277              
============================================
  Files            63       63              
  Lines          3120     3120              
============================================
- Hits           3106     3105       -1     
- Misses           14       15       +1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.