Drop the build target for net7.0

[martintmk]

Details on the issue fix or feature implementation

We are not using anything from net7.0 so having net6.0 is enough.

Closes #1534

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (5894fd9) 83.92% compared to head (3d553ad) 83.92%.
Report is 5 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1572   +/-   ##
=======================================
  Coverage   83.92%   83.92%           
=======================================
  Files         279      279           
  Lines        6520     6520           
  Branches     1017     1017           
=======================================
  Hits         5472     5472           
  Misses        839      839           
  Partials      209      209           

Flag	Coverage Δ
linux	?
macos	83.92% <ø> (ø)
windows	83.92% <ø> (ø)

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