Revert bump to Microsoft.Extensions.DependencyModel (Revert part of #847)

[DaveTryon]

PR #847 bumped both Microsoft.Extensions.DependencyModel and System.Text.Json. It passed all local tests and successfully passed the PR checks, but after it merged, it was causing test failures in the CI pipeline. I ran 2 iterations of the CI pipeline, one reverting both version bumps, and one reverting just Microsoft.Extensions.DependencyModel. They both passed. Bumping System.Text.Json is a good thing, so this PR backs out just the bump to Microsoft.Extensions.DependencyModel

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.50%. Comparing base (66f405b) to head (7e7d2f2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #851      +/-   ##
==========================================
+ Coverage   44.50%   46.50%   +2.00%     
==========================================
  Files         355      355              
  Lines       14142    14142              
  Branches     1161     1161              
==========================================
+ Hits         6294     6577     +283     
+ Misses       7308     7017     -291     
- Partials      540      548       +8     

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