Update publish to net 8.0

Author: mmanela

.github/workflows/publish.yml

@@ -10,7 +10,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: 8.x
       - run: dotnet pack
       - run: dotnet nuget push 'ScipDotnet/bin/Release/*.nupkg' --source 'nuget.org' --api-key '${{ secrets.NUGET_APIKEY }}' --skip-duplicate
   docker-push:
@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v3
       - uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: 7.0.x
+          dotnet-version: 8.x
       - uses: docker/setup-buildx-action@v2
       - run: echo "PATCH=${GITHUB_REF/refs\/tags\//}" >> $GITHUB_ENV
       - run: echo "MINOR=${PATCH%.*}" >> $GITHUB_ENV
@@ -39,4 +39,3 @@ jobs:
             sourcegraph/scip-dotnet:${{ env.PATCH }}
             sourcegraph/scip-dotnet:${{ env.MINOR }}
             sourcegraph/scip-dotnet:${{ env.MAJOR }}
-