chore: update .NET version installed by azure-static-app.yml

The **Azure Static Web Apps CI/CD** stage is failing:

	Error: /usr/share/dotnet/sdk/8.0.301/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets(166,5): error NETSDK1045:
	  The current .NET SDK does not support targeting .NET 9.0.
	  Either target .NET 8.0 or lower, or use a version of the .NET SDK that supports .NET 9.0.
	  Download the .NET SDK from https://aka.ms/dotnet/download

Update `azure-static-app.yml` to install .NET 9.0.308.

Author: jonpryor

.github/workflows/azure-static-app.yml

@@ -21,15 +21,15 @@ jobs:
     container: 'unoplatform/wasm-build:3.0'
     name: Build and Deploy Job
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v5
         with:
           fetch-depth: 0 # Required for gitversion
           submodules: true
 
-      - name: Setup dotnet 8.0.301
-        uses: actions/setup-dotnet@v3
+      - name: Setup dotnet 9.0.308
+        uses: actions/setup-dotnet@v5
         with:
-          dotnet-version: '8.0.301'
+          dotnet-version: '9.0.308'
 
       - uses: dotnet/nbgv@f088059084cb5d872e9d1a994433ca6440c2bf72 # v0.4.2
         id: nbgv