return type of db-oracle testSerialized is corrected

[MrWasimAbbasi]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fixed issues	return type of method corrected

[what-the-diff]

PR Summary

• Modified Return Type in Test Function
  In ConnectionTest.php, the testSerialized function has been updated so now it specifies that it doesn't return anything, termed as void. This addition improves the readability of the code and helps prevent potential errors that might occur from expecting this function to return some value.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.02%. Comparing base (2211130) to head (e45ea93).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #258   +/-   ##
=========================================
  Coverage     98.02%   98.02%           
  Complexity      175      175           
=========================================
  Files            16       16           
  Lines           556      556           
=========================================
  Hits            545      545           
  Misses           11       11           

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