update release.yml pipeline to use .net9

Author: xeofd

.github/workflows/release.yml

@@ -8,13 +8,17 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Verify commit exists in origin/main
         run: |
           git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*
           git branch --remote --contains | grep origin/main
       - name: Set VERSION variable from tag
         run: echo "VERSION=${GITHUB_REF/refs\/tags\/v/}" >> $GITHUB_ENV
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+         dotnet-version: 9.0.x
       - name: Build
         run: dotnet build --configuration Release /p:Version=${VERSION}
       - name: Test