Bump open dependency updates together

Copilot, please update all the packages listed below to the listed target versions in a single PR with a single commit.

Make no other changes beyond the version updates (and the lockfile changes they require, if any).
Never downgrade: if the default branch already has a version equal to or newer than the target, leave that reference as is.
Keep the build and tests green.
In the PR description, mention that it supersedes the Dependabot PRs listed below (Bump Microsoft.CodeAnalysis.CSharp from 5.0.0 to 5.9.0 #2, Bump the tests group with 1 update #11).

Package	From	To	Dependabot PR
`Microsoft.CodeAnalysis.CSharp`	5.0.0	5.9.0	#2
`xunit.runner.visualstudio`	4.0.0	4.0.1	#11

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