Add support for cargo and dotnet-sdk in Dependabot

Author: DoubleStyx

.github/dependabot.yml

@@ -5,7 +5,11 @@
 
 version: 2
 updates:
-  - package-ecosystem: "" # See documentation for possible values
+  - package-ecosystem: "cargo" # See documentation for possible values
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
+  - package-ecosystem: "dotnet-sdk"
+    directory: "/"
+    schedule:
+      interval: "weekly"