chore: update gh actions to .net 9

Author: buehler

.github/workflows/dotnet-release.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 8.x
+          dotnet-version: 9.x
 
       - name: Semantic Release
         uses: cycjimmy/semantic-release-action@v4

.github/workflows/dotnet-test.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 8.x
+          dotnet-version: 9.x
 
       - name: Linting
         run: dotnet format --verify-no-changes

.github/workflows/gh-pages.yml

@@ -25,7 +25,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 8.x
+          dotnet-version: 9.x
 
       - run: dotnet tool restore
 

.github/workflows/security-analysis.yml

@@ -33,7 +33,7 @@ jobs:
       - name: Setup .NET
         uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 8.x
+          dotnet-version: 9.x
 
       - name: Build
         run: dotnet build --configuration Release