Now pull

Enable guix pull since the package relies on very recent definitions

.github/workflows/pack.yml

@@ -17,7 +17,7 @@ jobs:
       - name: Install Guix
         uses: PromyLOPh/guix-install-action@v1
         with:
-          pullAfterInstall: false
+          pullAfterInstall: true
       - name: Ensure no locale warning
         run: test -z "$(guix --version 2>&1 >/dev/null)"
       - name: Checkout repository