Fix CI on macOS

.github/workflows/ci.yml

@@ -117,7 +117,7 @@ jobs:
     - name: Install brew dependencies (macOS)
       if: runner.os == 'macOS'
       run: |
-        brew install python@3.8
+        brew install python@3.12
 
     - name: Install Xcode (macOS)
       if: runner.os == 'macOS'
@@ -134,9 +134,9 @@ jobs:
     - name: Install python3 cryptography module (macOS)
       if: runner.os == 'macOS'
       run: |
-        python3.8 -m ensurepip
-        python3.8 -m pip install --upgrade pip
-        python3.8 -m pip install cryptography
+        python3.12 -m ensurepip
+        python3.12 -m pip install --upgrade pip
+        python3.12 -m pip install cryptography
 
     - name: Find the latest version of Python (Windows)
       if: runner.os == 'Windows'
@@ -181,9 +181,9 @@ jobs:
       working-directory: ${{github.workspace}}/build
       if: runner.os == 'macOS'
       run: |
-        python3.8 --version
-        python3.8 -c "import sys; print(sys.executable)"
-        python3.8 -c "import cryptography; print(f'Python3 cryptography version {cryptography.__version__}')"
+        python3.12 --version
+        python3.12 -c "import sys; print(sys.executable)"
+        python3.12 -c "import cryptography; print(f'Python3 cryptography version {cryptography.__version__}')"
 
     - name: List files (Linux/macOS)
       if: runner.os != 'Windows'