Update NuGet package validation tool to latest version

[atifaziz]

This PR updates the Meziantou.Framework.NuGetPackageValidation.Tool package to its latest version (1.0.14) so that .NET 7 is not required.

[codecov[bot]]

Codecov Report

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

Project coverage is 93.62%. Comparing base (017e477) to head (bd10cf9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1068 +/- ## ======================================= Coverage 93.62% 93.62% ======================================= Files 112 112 Lines 3374 3374 Branches 957 957 ======================================= Hits 3159 3159 Misses 199 199 Partials 16 16 ```

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