Update .NET SDK (#1114)

Update .NET SDK to version 7.0.203.

---
updated-dependencies:
- dependency-name: Microsoft.NET.Sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "7.0.202",
+    "version": "7.0.203",
     "allowPrerelease": false,
     "rollForward": "latestMajor"
   }