chore(ci): use net8.0 as a default target framework in Tests and Examples

[bednar]

Proposed Changes

Add supports for net8.0 in tests and examples.

Checklist

• [x] CHANGELOG.md updated
• [x] Rebased/mergeable
• [x] Tests pass
• [x] Commit messages are conventional
• [x] Sign CLA (if not already signed)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.47%. Comparing base (3504f5f) to head (91b860b).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #80 +/- ## ======================================= Coverage 95.47% 95.47% ======================================= Files 12 12 Lines 1017 1017 Branches 127 127 ======================================= Hits 971 971 Misses 11 11 Partials 35 35 ```

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