Remove old backwards-compatibility stub

[Dreamsorcerer]

Closes #2164.

According to the linked issue this was supposed to be removed in v3.

[codecov]

Codecov Report

Attention: Patch coverage is 98.73418% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.70%. Comparing base (bc0878b) to head (4e4d3e8).
Report is 860 commits behind head on master.

Files with missing lines	Patch %	Lines
tests/test_web_functional.py	98.85%	1 Missing ⚠️
tests/test_web_urldispatcher.py	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8596      +/-   ##
==========================================
- Coverage   97.70%   97.70%   -0.01%     
==========================================
  Files         107      107              
  Lines       33443    33438       -5     
  Branches     3927     3927              
==========================================
- Hits        32677    32672       -5     
  Misses        555      555              
  Partials      211      211              

Flag	Coverage Δ
CI-GHA	97.61% <98.73%> (-0.01%)	⬇️
OS-Linux	97.27% <98.73%> (-0.01%)	⬇️
OS-Windows	95.64% <98.73%> (-0.01%)	⬇️
OS-macOS	96.94% <98.73%> (+<0.01%)	⬆️
Py-3.10.11	97.08% <98.73%> (-0.01%)	⬇️
Py-3.10.14	97.02% <98.73%> (-0.01%)	⬇️
Py-3.11.9	97.25% <98.73%> (-0.01%)	⬇️
Py-3.12.4	97.38% <98.73%> (+<0.01%)	⬆️
Py-3.8.10	95.40% <98.73%> (-0.01%)	⬇️
Py-3.8.18	96.91% <98.73%> (-0.01%)	⬇️
Py-3.9.13	97.07% <98.73%> (-0.01%)	⬇️
Py-3.9.19	97.02% <98.73%> (-0.01%)	⬇️
Py-pypy7.3.16	96.59% <98.73%> (-0.01%)	⬇️
VM-macos	96.94% <98.73%> (+<0.01%)	⬆️
VM-ubuntu	97.27% <98.73%> (-0.01%)	⬇️
VM-windows	95.64% <98.73%> (-0.01%)	⬇️

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