return type of method is corrected.

[MrWasimAbbasi]

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

[what-the-diff[bot]]

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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 ```

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