Update github actions to non-deprecated versions

.github/workflows/Manylinux_2_28.yml

@@ -79,7 +79,7 @@ jobs:
       VISUALISATION: ${{ matrix.VISUALISATION }}
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     # Downgrade the gcc-toolset in the image based on the build matrix, using:
     # gcc-10 for CUDA >= 11.2. Unclear if gcc-toolset-10 will upgrade to unpatched 11.3 which breaks CUDA builds that use <chrono>. 
@@ -174,7 +174,7 @@ jobs:
     # Use a unique name per job matrix run, to avoid a risk of corruption according to the docs (although it should work with unique filenames)
     - name: Upload Wheel Artifacts
       if: ${{env.FLAMEGPU_BUILD_PYTHON == 'ON' }}
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ env.ARTIFACT_NAME }}
         path: ${{ env.BUILD_DIR }}/lib/${{ env.CONFIG }}/python/dist/*.whl