build and test on ubuntu-latest and set up .NET versions (main.net cl 114090, 114091, 114093 --> .NET 14.1.2.0)

[git-p4: depot-paths = "//dev/release.net/coherence-net-v14.1.2.0/": change = 114102]

Author: fryp

.github/workflows/build.yml

@@ -32,12 +32,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-20.04, windows-latest, macOS-latest]
+        os: [ubuntu-latest, windows-latest, macOS-latest]
 
     steps:
     - name: Checkout
       uses: actions/checkout@v3
 
+      # Set up .NET versions
+    - name: Set up dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          6.x
+          8.x
+
     # Clean
     - name: Clean
       run: dotnet nuget locals all --clear
@@ -51,7 +59,7 @@ jobs:
   test-linux:
     name: Test on Linux against Coherence ${{ matrix.coherence_version }}
     needs: build
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
@@ -61,6 +69,14 @@ jobs:
     - name: Checkout
       uses: actions/checkout@v3
 
+    # Set up .NET versions
+    - name: Set up dotnet
+      uses: actions/setup-dotnet@v4
+      with:
+        dotnet-version: |
+          6.x
+          8.x
+
     # Set up Java 17
     - name: Set up JDK
       uses: actions/setup-java@v3