fix: pass size to content cb in MockRequestBuilder

[jojoguru]

Since the callback function expects a $size argument from symfony 7.2 onwards

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.80%. Comparing base (47e0d3c) to head (24f2b82).
Report is 58 commits behind head on main.

Files with missing lines	Patch %	Lines
src/HttpClientMock/MockRequestBuilderFactory.php	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #87      +/-   ##
============================================
+ Coverage     52.04%   60.80%   +8.75%     
- Complexity      537      727     +190     
============================================
  Files            34       48      +14     
  Lines          1587     2074     +487     
============================================
+ Hits            826     1261     +435     
- Misses          761      813      +52     

Flag	Coverage Δ
unittests	60.80% <0.00%> (+8.75%)	⬆️

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[github-actions]

🎉 This PR is included in version 6.1.4 🎉

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