Update to .net8 runner

Author: linkdotnet

.github/workflows/codeql.yml

@@ -24,10 +24,14 @@ jobs:
       - name: Checkout repository
         uses: actions/[email protected]
 
-      - uses: actions/[email protected]
+      - uses: actions/checkout@v3
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
-          include-prerelease: true
+          dotnet-version: | 
+            6.0.x
+            7.0.x
+            8.0.x
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v2

.github/workflows/dotnet.yml

@@ -23,6 +23,7 @@ jobs:
         dotnet-version: | 
           6.0.x
           7.0.x
+          8.0.x
     - name: Restore dependencies
       run: dotnet restore
     - name: Build