Revert "update GitHub Actions"

This reverts commit 2ea7c5a706.

It's broken: https://github.com/actions/download-artifact/issues/249

.github/workflows/generate-srcinfo.yml

@@ -51,7 +51,7 @@ jobs:
         run: |
           msys2-pypi-cache srcinfo.json.gz pypi.json.gz
 
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v3
         with:
           name: result
           path: |
@@ -64,7 +64,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         with:
           name: result
 

.github/workflows/main.yml

@@ -96,7 +96,7 @@ jobs:
 
       - name: "Upload binaries"
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.msystem }}-packages
           path: C:/_/artifacts/*.pkg.tar.*
@@ -104,7 +104,7 @@ jobs:
 
       - name: "Upload dumps"
         if: ${{ !cancelled() }}
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v3
         with:
           name: ${{ matrix.msystem }}-dumps
           path: ${{ runner.temp }}/_dumps/*.dmp
@@ -124,7 +124,7 @@ jobs:
     runs-on: windows-2022
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         continue-on-error: true
         with:
           name: UCRT64-packages
@@ -169,7 +169,7 @@ jobs:
             repo: clang64
 
     steps:
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         id: artifacts
         continue-on-error: true
         with: