Install python3.11 on CentOS 7 for signing step

Also some other cleanups; always use checkout action v4 because we can now.

Signed-off-by: Gary Oberbrunner <[email protected]>

.github/workflows/build.yml

@@ -46,7 +46,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 3
             cuda: false
             opencl: true
           - name_prefix: Linux CentOS 7 VFX CY2022
@@ -64,7 +63,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 3
             cuda: false
             opencl: true
           - name_prefix: Linux Rocky 8 VFX CY2023
@@ -81,7 +79,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             cuda: false
             opencl: true
           - name_prefix: Linux Rocky 8 VFX CY2023 No OpenGL
@@ -98,7 +95,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             opengl: false
           - name_prefix: Linux Ubuntu
             release_prefix: linux-ubuntu
@@ -112,7 +108,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             cuda: true
             opencl: true
           - name_prefix: MacOS
@@ -126,7 +121,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             cuda: false
             opencl: true
           - name_prefix: Windows
@@ -140,7 +134,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             cuda: true
             opencl: true
           - name_prefix: Windows no CUDA
@@ -154,7 +147,6 @@ jobs:
             cxx-compiler: clang++
             cc-compiler: clang
             compiler-desc: Clang
-            checkout_version: 4
             cuda: false
             opencl: false
     defaults:
@@ -167,16 +159,8 @@ jobs:
           curl --silent https://unofficial-builds.nodejs.org/download/release/v20.18.1/node-v20.18.1-linux-x64-glibc-217.tar.xz | \
             tar -xJ --strip-components 1 -C /node20217 -f -
 
-      - name: Checkout code (v4)
+      - name: Checkout code
         uses: actions/checkout@v4
-        if: matrix.checkout_version == 4
-        with:
-          clean: true
-          fetch-depth: 0
-
-      - name: Checkout code (v3)
-        uses: actions/checkout@v3
-        if: matrix.checkout_version == 3
         with:
           clean: true
           fetch-depth: 0
@@ -205,7 +189,7 @@ jobs:
 
       - name: Set up python 3.11
         uses: actions/setup-python@v5
-        if: matrix.ostype == 'mac'
+        if: matrix.ostype == 'mac' || matrix.release_prefix == 'linux-vfx2021'
         with:
           python-version: '3.11'
 
@@ -233,7 +217,7 @@ jobs:
           echo -n 'which python: ' && which python
           echo -n 'which python3: ' && which python3
           echo -n 'python version: ' && python --version
-          echo -n 'python3 version: ' python3 --version
+          echo -n 'python3 version: ' && python3 --version
           which uv || echo "No python uv; continuing"
 
       - name: Install Conan