Dependency (dependabot/dotnet-sdk): Bump dotnet-sdk in /Source

Bumps [dotnet-sdk](https://github.com/dotnet/sdk) from 8.0.100 to 9.0.100.
- [Release notes](https://github.com/dotnet/sdk/releases)
- [Commits](dotnet/sdk@v8.0.100...v9.0.100)

---
updated-dependencies:
- dependency-name: dotnet-sdk
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Source/global.json

@@ -1,6 +1,6 @@
 {
   "sdk": {
-    "version": "8.0.100",
+    "version": "9.0.100",
     "rollForward": "latestFeature",
     "allowPrerelease": false
   }