Improve Downgrade workflow

Author: fhagemann

.github/workflows/Downgrade.yml

@@ -24,6 +24,8 @@ jobs:
       - uses: julia-actions/julia-downgrade-compat@v2
 #        if: ${{ matrix.version == '1.6' }}
         with:
+          julia_version: ${{ matrix.version }}
+          mode: alldeps
           skip: Pkg,TOML
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1