Downgrade also the download-artifact action

It has to have the same version as upload-artifact.

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
(Merged from https://github.com/openssl/openssl/pull/24065)

.github/workflows/provider-compatibility.yml

@@ -201,7 +201,7 @@ jobs:
           fi
         continue-on-error: true
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         if: steps.early_exit.outcome == 'success'
         with:
           name: ${{ matrix.tree_a }}.tar.gz
@@ -209,7 +209,7 @@ jobs:
         if: steps.early_exit.outcome == 'success'
         run: tar xzf "${{ matrix.tree_a }}.tar.gz"
 
-      - uses: actions/download-artifact@v4
+      - uses: actions/download-artifact@v3
         if: steps.early_exit.outcome == 'success'
         with:
           name: ${{ matrix.tree_b }}.tar.gz