Fix CI, remove Serialization, update licenses

Signed-off-by: Victor Chang <vicchang@nvidia.com>

Author: mocsharp

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
 
     - uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: "6.0.x"
+        dotnet-version: "8.0.x"
 
     - name: Enable NuGet cache
       uses: actions/cache@v3.3.0
@@ -84,7 +84,7 @@ jobs:
         fetch-depth: 0
     - uses: actions/setup-dotnet@v3
       with:
-        dotnet-version: "6.0.x"
+        dotnet-version: "8.0.x"
 
     - name: Enable Homebrew
       run: echo "/home/linuxbrew/.linuxbrew/bin:/home/linuxbrew/.linuxbrew/sbin" >> $GITHUB_PATH
@@ -130,7 +130,7 @@ jobs:
 
       - uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: "6.0.x"
+          dotnet-version: "8.0.x"
 
       - name: Enable NuGet cache
         uses: actions/cache@v3.3.0
@@ -223,7 +223,7 @@ jobs:
 
       - uses: actions/setup-dotnet@v3
         with:
-          dotnet-version: "6.0.x"
+          dotnet-version: "8.0.x"
 
       - name: Enable NuGet cache
         uses: actions/cache@v3.3.0
@@ -311,7 +311,7 @@ jobs:
         env:
           NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
         with:
-          dotnet-version: "6.0.x"
+          dotnet-version: "8.0.x"
           source-url: https://nuget.pkg.github.com/Project-MONAI/index.json
 
       - name: Publish to GitHub
@@ -336,7 +336,7 @@ jobs:
         env:
           NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
         with:
-          dotnet-version: "6.0.x"
+          dotnet-version: "8.0.x"
           source-url: https://nuget.pkg.github.com/Project-MONAI/index.json
 
       - name: Publish to GitHub