(dependabot) Add .NET SDK to Dependabot configuration

This commit introduces the .NET SDK to the Dependabot configuration file. By doing so, it ensures that dependencies for .NET SDK are automatically tracked and updated. Labels and commit message prefixes are also specified for consistency.

Author: arturcic

.github/dependabot.yml

@@ -1,5 +1,13 @@
 version: 2
 updates:
+- package-ecosystem: dotnet-sdk
+  labels:
+      - "dependencies"
+  commit-message:
+      prefix: "(deps)"
+  directory: "/"
+  schedule:
+    interval: daily
 - package-ecosystem: nuget
   labels:
     - "dependencies"