chore(build): add dotnot 9 to prerequisite check

[msambol]

Issue # (if applicable)

Closes #32282.

Reason for this change

.NET 9 is now out: https://devblogs.microsoft.com/dotnet/announcing-dotnet-9

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.46%. Comparing base (81cde0e) to head (e61ee3b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #32158      +/-   ##
==========================================
+ Coverage   78.45%   78.46%   +0.01%     
==========================================
  Files         106      106              
  Lines        7208     7208              
  Branches     1323     1323              
==========================================
+ Hits         5655     5656       +1     
+ Misses       1365     1364       -1     
  Partials      188      188              

Flag	Coverage Δ
suite.unit	78.46% <ø> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	78.46% <ø> (+0.01%)	⬆️

[nmussy]

LGTM

[gracelu0]

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[mergify]

update

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Pull request has been modified.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: e61ee3b
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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