Bump xunit.runner.visualstudio from 2.8.2 to 4.0.0

[dependabot]

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Updated xunit.runner.visualstudio from 2.8.2 to 4.0.0.

Release notes

Sourced from xunit.runner.visualstudio's releases.

4.0.0

Release notes: https://xunit.net/releases/visualstudio/4.0.0

4.0.0-pre.5

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.5

4.0.0-pre.4

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.4

4.0.0-pre.3

Release notes: https://xunit.net/releases/visualstudio/4.0.0-pre.3

3.1.5

Release notes: https://xunit.net/releases/visualstudio/3.1.5

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[kenhayward]

Closing: this bump reproducibly breaks the integration suite.

There are three PRs for the same upgrade, scoped differently - #704 (both test projects), #706
(IntegrationTests only) and #707 (Tests only). #704 and #706 are independent branches, and both
fail .NET integration (Testcontainers) on the same two tests:

VectorIndexIntegrationTests.UnfencedSemanticSql_CanPlanOntoTheAnnIndex                    [FAIL]
VectorIndexIntegrationTests.UnfencedSemanticSql_ReturnsTheSameNeighbours_AsTheExactScan   [FAIL]
Failed: 2, Passed: 496

with expected an ordered scan of IX_TranscriptChunks_Embedding; the plan was: ... Sort.

Every other open dependency PR is green on that job, including #700, which moved 14 NuGet packages
across four projects and all four lock files.

This is not a framework incompatibility: xunit.runner.visualstudio 4.0.0 still advertises support
for xunit v1, v2 and v3, so it is compatible with xunit 2.9.x in principle. The likelier cause is that
the runner major changes test discovery order or parallelism, and those two tests assert on a Postgres
query plan - which depends on how many rows earlier tests have left in the shared Testcontainers
database.

So the underlying fragility is arguably in the tests rather than in the package. Until that is fixed,
merging this would turn main red, so it is closed rather than held.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.