chore: set to use .net 8

.net 9 introduces a lot of new warnings that will fail the build. An effort is required to upgrade to .net 9 and resolve or ignore relevant warnings

Author: TomMalow

global.json

@@ -1,6 +1,7 @@
 {
   "sdk": {
-      "rollForward": "latestMajor",
-      "allowPrerelease": false
+    "version": "8.0.0",
+    "rollForward": "latestMinor",
+    "allowPrerelease": false
   }
 }