Configure renovate to update msbuild SDKs

Author: Alxandr

renovate.json

@@ -1,5 +1,12 @@
 {
-  "extends": [
-    "config:base"
+  "extends": ["config:base"],
+  "regexManagers": [
+    {
+      "fileMatch": "global.json",
+      "matchStrings": [
+        "\"(?<depName>[^\"]*?\\.[^\"]*?)\":\\s*\"(?<currentValue>[^\"]*?)\""
+      ],
+      "datasourceTemplate": "nuget"
+    }
   ]
 }