Update runners to use older images for Ubuntu and MacOS

.github/workflows/managed.yml

@@ -21,7 +21,7 @@ jobs:
         submodules: true
         fetch-depth: 0
 
-    - name: Install .NET 6.0
+    - name: Install .NET 7.0
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: '7.0.x'

.github/workflows/native.yml

@@ -18,13 +18,13 @@ jobs:
   build:
     strategy:
       matrix:
-        os: [ubuntu-latest, windows-latest, macOS-latest]
+        os: [ubuntu-20.04, windows-latest, macos-11]
     runs-on: ${{ matrix.os }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v3
     - name: Build Linux
-      if: matrix.os == 'ubuntu-latest'
+      if: matrix.os == 'ubuntu-20.04'
       run: |
           chmod 755 *.sh
           echo "building linux-x64"
@@ -36,7 +36,7 @@ jobs:
           sudo apt-get install gcc-arm-linux-gnueabihf      
           ./build-linux-arm.sh
     - name: Build macOS
-      if: matrix.os == 'macOS-latest'
+      if: matrix.os == 'macos-11'
       run: |
           chmod 755 *.sh
           ./build-osx-x64.sh