Update the GHA artifacts actions to v4

Author: bjorn3

.github/workflows/main.yml

@@ -253,14 +253,14 @@ jobs:
 
     - name: Upload prebuilt cg_clif
       if: matrix.os == 'windows-latest' || matrix.env.TARGET_TRIPLE != 'x86_64-pc-windows-gnu'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cg_clif-${{ matrix.env.TARGET_TRIPLE }}
         path: cg_clif.tar.xz
 
     - name: Upload prebuilt cg_clif (cross compile)
       if: matrix.os != 'windows-latest' && matrix.env.TARGET_TRIPLE == 'x86_64-pc-windows-gnu'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: cg_clif-${{ runner.os }}-cross-x86_64-mingw
         path: cg_clif.tar.xz
@@ -279,7 +279,7 @@ jobs:
       - uses: actions/checkout@v3
 
       - name: Download all built artifacts
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           path: artifacts/