Bump actions/checkout from 5 to 6 (#252)

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -35,7 +35,7 @@ jobs:
             version: 'min'
             arch: x64
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
@@ -68,7 +68,7 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1'

.github/workflows/Downstream.yml

@@ -28,7 +28,7 @@ jobs:
           - 'HTTP'
           - 'ZipStreams'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: 1