Bump xunit.runner.visualstudio from 2.4.5 to 2.5.6

[dependabot[bot]]

Bumps xunit.runner.visualstudio from 2.4.5 to 2.5.6.

Commits

• bf9b858 v2.5.6
• b05cd38 Latest dependencies
• 3423937 Experiment: Rename adapter assembly
• 0e604e4 Experiment: Remove all file copies
• 6dff757 Bump up to v2.5.6-pre
• 28b46ff v2.5.5
• 409be7a Add PackageId to solve VS issues (see dotnet/sdk#22...
• 56db5de Latest dependencies (and use ExecutionSink instead of delegating sinks)
• 1f419e6 Update README
• f052a1d Bump up to v2.5.5-pre
• Additional commits viewable in compare view

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[dependabot[bot]]

A newer version of xunit.runner.visualstudio exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.