Update run-tests-reusable.yml

.github/workflows/run-tests-reusable.yml

@@ -24,15 +24,15 @@ jobs:
     runs-on: ${{ inputs.os }}
     name: ${{ inputs.os }}-${{ inputs.matlab-version }}-${{ inputs.julia-version }}
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
-
       - name: Install G++ version 8
         if: startsWith(${{ inputs.os }}, 'ubuntu')
         run: |
           sudo apt-get install g++-8
           export CXX=/usr/bin/g++-8
-          
+
+      - name: Checkout code
+        uses: actions/checkout@v4     
+
       - uses: julia-actions/install-juliaup@v2
         with:
           channel: ${{ inputs.julia-version }}