fix pytest installation

Author: dienhoa

.github/workflows/cross_platform_tests.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false  # Continue with other jobs if one fails
       matrix:
-        python-version: ['3.10', '3.11']
+        python-version: ['3.10']
 
     steps:
     - uses: actions/checkout@v4
@@ -37,6 +37,12 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Create virtual environment
+      run: |
+        python -m venv .venv
+        echo "VIRTUAL_ENV=$PWD/.venv" >> $GITHUB_ENV
+        echo "$PWD/.venv/bin" >> $GITHUB_PATH
+        
     - name: Install dependencies for testing
       run: |
         python -m pip install --upgrade pip
@@ -47,12 +53,6 @@ jobs:
       run: pip install c2pa-python
       continue-on-error: true  # Continue even if c2pa-python install fails
 
-    - name: Create virtual environment
-      run: |
-        python -m venv .venv
-        echo "VIRTUAL_ENV=$PWD/.venv" >> $GITHUB_ENV
-        echo "$PWD/.venv/bin" >> $GITHUB_PATH
-        
     - name: Build and install package with maturin
       uses: PyO3/maturin-action@v1
       with: