Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -21,7 +21,7 @@ jobs:
           - "1"
           - "1.6"
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}

.github/workflows/Downstream.yml

@@ -28,14 +28,14 @@ jobs:
           - { user: LuxDL, repo: LuxTestUtils.jl, group: All }
     if: contains(github.event.pull_request.labels.*.name, 'run downstream test')
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.julia-version }}
           arch: x64
       - uses: julia-actions/julia-buildpkg@v1
       - name: Clone Downstream
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         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@v3
+      - uses: actions/checkout@v4
       - name: Install JuliaFormatter and format
         run: |
           julia  -e 'using Pkg; Pkg.add(PackageSpec(name="JuliaFormatter"))'

.github/workflows/FormatPR.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install JuliaFormatter and format
         run: |
           julia  -e 'using Pkg; Pkg.add(PackageSpec(name="JuliaFormatter"))'

.github/workflows/Invalidations.yml

@@ -19,12 +19,12 @@ jobs:
       - uses: julia-actions/setup-julia@v1
         with:
           version: "1"
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-invalidations@v1
         id: invs_pr
 
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.repository.default_branch }}
       - uses: julia-actions/julia-buildpkg@v1