[Repo Assist] Update NuGet dependencies (minor/patch)

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🤖 This is an automated PR from Repo Assist.

Summary

Bumps several NuGet dependencies to their latest minor or patch releases. All major-version bumps (FsCheck, FsUnit, NUnit3TestAdapter, System.IO.Abstractions, DotNet.ReproducibleBuilds) are intentionally excluded to minimise risk.

Package	From	To	Change
Newtonsoft.Json	13.0.3	13.0.4	patch
Argu	6.2.4	6.2.5	patch
Serilog	4.1.0	4.3.1	minor
Serilog.Sinks.Console	6.0.0	6.1.1	minor
StreamJsonRpc	2.20.20	2.24.84	minor
BenchmarkDotNet	0.14.0	0.15.8	minor
CliWrap	3.6.7	3.10.0	minor
NUnit	4.2.2	4.5.1	minor
G-Research.FSharp.Analyzers	0.18.0	0.22.0	minor (dev tool)
Ionide.Analyzers	0.14.7	0.15.0	minor (dev tool)

Lock files regenerated with dotnet restore --force-evaluate.

Test Status

• ✅ dotnet restore --force-evaluate succeeded — all lock files updated
• ⚠️ Local build has two pre-existing infrastructure issues unrelated to these changes:
  • CheckFormat fails because the source was formatted with Fantomas v8 alpha but the local tool is pinned to v7.0.1
  • GetChangelogVersion fails because CHANGELOG.md currently has only [Unreleased] (no released version header), causing Ionide.KeepAChangelog.Tasks to error
  • Both issues reproduce on main before any changes from this PR
• CI should verify the actual compilation and test run

Skipped updates

The following have major-version bumps and were left for a separate, deliberate review:

• FsCheck: 2.16.5 → 3.3.2 (major; API changes expected)
• FsUnit: 6.0.1 → 7.1.1 (major)
• NUnit3TestAdapter: 4.6.0 → 6.1.0 (major)
• System.IO.Abstractions: 21.1.3 → 22.1.0 (major)
• DotNet.ReproducibleBuilds: 1.1.1 → 2.0.2 (major)
• Ionide.KeepAChangelog.Tasks: 0.3.1 → 0.3.3 (minor, but 0.3.3 caused GetChangelogVersion failures in testing — needs investigation)

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