Merge pull request #329 from SciML/dependabot/github_actions/actions/checkout-4

Bump actions/checkout from 3 to 4

Author: ChrisRackauckas

.github/workflows/Downgrade.yml

@@ -17,7 +17,7 @@ jobs:
       matrix:
         version: ['1']
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}