chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/Documentation.yml

@@ -35,7 +35,7 @@ jobs:
             dir: './DifferentiationInterfaceTest'
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: '1'  # TODO: 1

.github/workflows/PreCommit.yml

@@ -18,7 +18,7 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
       - uses: julia-actions/cache@v2
       - run: julia -e 'using Pkg; Pkg.add("Runic")'

.github/workflows/Test.yml

@@ -49,7 +49,7 @@ jobs:
       JULIA_DI_TEST_GROUP: ${{ matrix.group }}
       JULIA_DI_PR_DRAFT: ${{ github.event.pull_request.draft }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
@@ -134,7 +134,7 @@ jobs:
       JULIA_DI_TEST_GROUP: ${{ matrix.group }}
       JULIA_DI_PR_DRAFT: ${{ github.event.pull_request.draft }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
@@ -190,7 +190,7 @@ jobs:
       JULIA_DIT_TEST_GROUP: ${{ matrix.group }}
       JULIA_DI_PR_DRAFT: ${{ github.event.pull_request.draft }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}