Maintenance release with better Redis Cluster connectivity in corner cases, source link support with embedded sources, signed NuGet packages and their assemblies with our code-signing certificate and more secure CI pipeline.

• Changed – Update StackExchange.Redis binaries for better cluster connectivity and better logging.
• Changed – Enable source link with fully embedded sources to simplify debugging.
• Project – Sign NuGet packages and assemblies with a company’s own code-signing certificate.
• Project – Require NuGet package signature validation on restore for dependencies.
• Project – Use deterministic and locked package restore for everything.
• Project – Modernize the build system and add icon for NuGet packages.
• Project – Run tests against already merged assemblies.
• Project – Add support to run test suite against Redis Cluster.