Bump Microsoft.AspNetCore.WebUtilities to 2.3.0

[martincostello]

Bump Microsoft.AspNetCore.WebUtilities to 2.3.0 so we depend a non-deprecated package.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.30%. Comparing base (e889e46) to head (a6560f4).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #997   +/-   ##
=======================================
  Coverage   99.30%   99.30%           
=======================================
  Files          15       15           
  Lines         868      868           
  Branches      198      198           
=======================================
  Hits          862      862           
  Misses          4        4           
  Partials        2        2           

Flag	Coverage Δ
linux	99.30% <ø> (ø)
macos	99.30% <ø> (ø)
windows	99.30% <ø> (ø)

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