chore: update dependency dotnet-sdk to v8.0.421 (#114)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.420",
+    "version": "8.0.421",
     "rollForward": "latestMajor"
   },
   "msbuild-sdks": {