Remove deprecated constants CSRF_MASK_LENGTH.

[terabytesoftw]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[what-the-diff]

PR Summary

• Deprecation and Removal of CSRF_MASK_LENGTH Constant
  The 'Request' system has been updated by removing an outdated part, specifically the CSRF_MASK_LENGTH constant. This simplifies the structure, potentially making it easier for additional features to be developed in the future.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +39.06% 🎉

Comparison is base (6618aa8) 28.12% compared to head (dc2ef34) 67.18%.

Additional details and impacted files

@@              Coverage Diff              @@
##                2.2   #19971       +/-   ##
=============================================
+ Coverage     28.12%   67.18%   +39.06%     
  Complexity    11209    11209               
=============================================
  Files           424      424               
  Lines         35617    35617               
=============================================
+ Hits          10016    23930    +13914     
+ Misses        25601    11687    -13914     

Files Changed	Coverage Δ
framework/web/Request.php	76.54% <ø> (+74.07%)	⬆️

... and 203 files with indirect coverage changes

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