Removing netcoreapp3.1 test target

This isn't able to run on Ubuntu 24 builders.
Initially was an ICU (Internationalization) failure.
Then configured off internationalization and got a libssl version error (Ubuntu 24 has 3.0 but .NET Core 3.1 expects 1.1)

Author: rkargMsft

.github/workflows/ci.yml

@@ -23,7 +23,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Build
       run: dotnet build
@@ -55,7 +54,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -83,7 +81,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Clustering)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -123,7 +120,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -159,7 +155,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -197,7 +192,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -235,7 +229,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&Category=${{ matrix.suite }}" --framework ${{ matrix.framework }} --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -318,7 +311,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -355,7 +347,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow
@@ -393,7 +384,6 @@ jobs:
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: |
-          3.1.x
           8.0.x
     - name: Test
       run: dotnet test --filter "Category=${{ matrix.provider }}&(Category=BVT|Category=SlowBVT|Category=Functional)" --blame-hang-timeout 10m --logger "trx" -- -parallel none -noshadow

test/Orleans.Serialization.UnitTests/Orleans.Serialization.UnitTests.csproj

@@ -2,12 +2,11 @@
 
   <PropertyGroup>
     <IsTestProject>true</IsTestProject>
-    <TargetFrameworks>$(TestTargetFrameworks);netcoreapp3.1</TargetFrameworks>
+    <TargetFrameworks>$(TestTargetFrameworks)</TargetFrameworks>
     <GenerateBindingRedirectsOutputType>true</GenerateBindingRedirectsOutputType>
     <OrleansBuildTimeCodeGen>true</OrleansBuildTimeCodeGen>
     <ImplicitUsings>disable</ImplicitUsings>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
-    <InvariantGlobalization>true</InvariantGlobalization>
   </PropertyGroup>
 
   <ItemGroup>