Specify which sdk to use in VC. Set base version for snapshot

Author: Brennan1994

.github/workflows/Snapshot.yml

@@ -10,6 +10,7 @@ jobs:
     with:
       dotnet-version: '9.0.x'
       project-names: 'Numerics'
+      version: '1.0.0'
       run-tests: true
       nuget-source: 'https://www.hec.usace.army.mil/nexus/repository/consequences-nuget-public/'
     secrets:

global.json

@@ -0,0 +1,6 @@
+{
+  "sdk": {
+    "version": "9.0.0",
+    "rollForward": "latestFeature"
+  }
+}