Update dependency System.Reactive to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
System.Reactive	6.1.0 → 7.0.0

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Dependency Review

The following issues were found:

• ✅ 0 vulnerable package(s)
• ✅ 0 package(s) with incompatible licenses
• ✅ 0 package(s) with invalid SPDX license definitions
• ⚠️ 1 package(s) with unknown licenses.

See the Details below.

License Issues

src/NetTestRegimentation.XUnit/NetTestRegimentation.XUnit.csproj

Package	Version	License	Issue Type
System.Reactive	7.0.0	Null	Unknown License

OpenSSF Scorecard

Package	Version	Score	Details
nuget/System.Reactive	7.0.0	🟢 3.9	Details Check Score Reason Maintained 🟢 10 10 commit(s) and 8 issue activity found in the last 90 days -- score normalized to 10 Code-Review 🟢 9 Found 27/30 approved changesets -- score normalized to 9 Packaging ⚠️ -1 packaging workflow not detected Dangerous-Workflow ⚠️ -1 no workflows found Token-Permissions ⚠️ -1 No tokens found CII-Best-Practices ⚠️ 0 no effort to earn an OpenSSF best practices badge detected License 🟢 10 license file detected Branch-Protection ⚠️ -1 internal error: error during branchesHandler.setup: internal error: some github tokens can't read classic branch protection rules: https://github.com/ossf/scorecard-action/blob/main/docs/authentication/fine-grained-auth-token.md Signed-Releases ⚠️ -1 no releases found Security-Policy ⚠️ 0 security policy file not detected SAST ⚠️ 0 SAST tool is not run on all commits -- score normalized to 0 Fuzzing ⚠️ 0 project is not fuzzed Binary-Artifacts ⚠️ 0 binaries present in source code Pinned-Dependencies ⚠️ -1 no dependencies found

Scanned Files

• src/NetTestRegimentation.XUnit/NetTestRegimentation.XUnit.csproj