chore(deps): update mcr.microsoft.com/devcontainers/dotnet docker tag to v1.2.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
mcr.microsoft.com/devcontainers/dotnet	image	minor	1.1.9-8.0-bookworm-slim -> 1.2.1-8.0-bookworm-slim

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 28.72%. Comparing base (aeda214) to head (d94c24f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   28.72%   28.72%           
=======================================
  Files          15       15           
  Lines         188      188           
  Branches       15       15           
=======================================
  Hits           54       54           
  Misses        133      133           
  Partials        1        1           

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