Bump actions/checkout from 1 to 3

.github/workflows/CI.yml

@@ -17,7 +17,7 @@ jobs:
           - '1'
           - '1.6'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}

.github/workflows/Downstream.yml

@@ -25,14 +25,14 @@ jobs:
           - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceIV}
           - {user: SciML, repo: OrdinaryDiffEq.jl, group: InterfaceV}
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.julia-version }}
           arch: x64
       - uses: julia-actions/julia-buildpkg@latest
       - name: Clone Downstream
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
           path: downstream

.github/workflows/FormatCheck.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           version: ${{ matrix.julia-version }}
 
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
       - name: Install JuliaFormatter and format
         # This will use the latest version by default but you can set the version like so:
         #