chore: upgrade all NuGet packages to latest (excluding MQTTnet)

[Copilot]

Bumps all NuGet dependencies to their latest stable versions across the solution, leaving MQTTnet and MQTTnet.Extensions.ManagedClient pinned at 4.3.7.1207.

Package updates

Package	Old → New
Microsoft.Extensions.* (Configuration, Hosting, Http, Logging, DI)	10.0.5 → 10.0.7
Microsoft.SourceLink.GitHub	10.0.201 → 10.0.203
Microsoft.Extensions.TimeProvider.Testing	10.4.0 → 10.5.0
YamlDotNet	16.3.0 → 17.1.0
Cronos	0.11.1 → 0.13.0
SolarCalculator	3.6.0 → 3.6.1
FluentAssertions	8.8.0 → 8.9.0
coverlet.collector / coverlet.msbuild	8.0.0 → 10.0.0
GitHubActionsTestLogger	3.0.1 → 3.0.4
Microsoft.NET.Test.Sdk	18.3.0 → 18.5.1
NuGet.Frameworks / NuGet.Protocol	7.3.0 → 7.3.1

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82%. Comparing base (e6f9d86) to head (674c0c4).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff          @@
##           main   #1362   +/-   ##
====================================
  Coverage    82%     82%           
====================================
  Files       202     202           
  Lines      3941    3941           
  Branches    444     444           
====================================
  Hits       3239    3239           
  Misses      532     532           
  Partials    170     170           

Flag	Coverage Δ
unittests	82% <ø> (ø)

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