chore: adds dependabot (#101)

* chore: adds dependabot

* chore: updates global.json sdk to latest version

Author: leonardochaia

.github/dependabot.yaml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+    # NuGet packages
+    - package-ecosystem: "nuget"
+      directory: "/"
+      schedule:
+          interval: "weekly"
+          day: "wednesday"
+      open-pull-requests-limit: 5
+      groups:
+          dotnet:
+              patterns:
+                  - "*"

global.json

@@ -1,6 +1,6 @@
 {
     "sdk": {
-        "version": "8.0.100",
+        "version": "8.0.401",
         "allowPrerelease": true
     }
 }