Fix download of sage_numerical_backends_coin

Author: tobiasdiez

.github/workflows/release.yml

@@ -38,11 +38,9 @@ jobs:
         env:
           MAKE: make -j8
 
-      - name: make download
+      - name: Download tarballs of all packages
         run: |
-          make -k download DOWNLOAD_PACKAGES=":all: --no-file huge --allow-upstream"
-        env:
-          MAKE: make -j8
+          build/bin/sage-package download :all: --no-file huge --allow-upstream
 
       - name: Remove what cannot be distributed
         run: |

build/pkgs/sage_numerical_backends_coin/package-version.txt

@@ -0,0 +1 @@
+10.4