Update upload/download-artifact actions

Author: oddhack

.github/workflows/CI.yml

@@ -117,7 +117,7 @@ jobs:
         # Make a single tarball to upload instead
         run: tar -cvf spec-outputs.tar gen/ genrat/
       - name: Archive generated spec
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: spec-outputs
           path: spec-outputs.tar
@@ -134,7 +134,7 @@ jobs:
       # Generate the vulkan C++ header (vulkan.hpp)
       # Failure (should be) allowed, for now
       - name: Download generated spec
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: spec-outputs
       - name: Unpack generated spec
@@ -152,7 +152,7 @@ jobs:
           cmake --build build --parallel
           cp vulkan/*.hpp ${SPEC_DIR}/gen/include/vulkan/
       - name: Upload generated hpp
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: hpp-outputs
           path: gen/include/
@@ -192,7 +192,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Download generated files
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: spec-outputs
       - name: Unpack generated spec
@@ -217,13 +217,13 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Download generated spec
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: spec-outputs
       - name: Unpack generated spec
         run: tar -xvf spec-outputs.tar
       - name: Download generated hpp
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: hpp-outputs
           path: gen/include/