XS✔ ◾ Add related blog post to .NET migration rules

[Ben0189]

1. What triggered this change? Email task - RE: Preparation for .NET 8 migration

2. What was changed? Added Adam blog post about .NET 8 migrations to the rules

3. Did you do pair or mob programming (list names)? no

[github-actions[bot]]

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✔ Thanks for keeping your pull request small. ✔ Thanks for adding tests.		Lines
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[github-actions[bot]]

Hi @Ben0189,

We found some markdown suggestions for your Pull Request:

File	Error	Rule
rules/why-upgrade-to-latest-dotnet/rule.md	Line 39 MD001/heading-increment Heading levels should only increment by one level at a time [Expected: levels should only increment by one level at a time	Rule MD001

Please review and update your Markdown files accordingly.