[skip ci] update downgrade CI repo

Author: ArnoStrouwen

.github/workflows/Downgrade.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}
-      - uses: cjdoris/julia-downgrade-compat-action@v1
+      - uses: julia-actions/julia-downgrade-compat@v1
         with:
           skip: Pkg,TOML
       - uses: julia-actions/julia-buildpkg@v1