Update GitHub Actions.

Author: twcrews

.github/workflows/release.yml

@@ -10,6 +10,10 @@ jobs:
     steps:
     - name: Checkout
       uses: actions/checkout@v2
+    - name: Setup dotnet
+      uses: actions/setup-dotnet@v5
+      with:
+        dotnet-version: 9.0.x
     - name: Verify commit exists in origin/master
       run: |
         git fetch --no-tags --prune --depth=1 origin +refs/heads/*:refs/remotes/origin/*