.github: Bump actions/checkout from 5.0.0 to 6.0.1 (#924)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.0 to 6.0.1.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@08c6903...8e8c483)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           fetch-depth: 0 # Allows using `git log` to set initial release notes.
 
@@ -51,7 +51,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: On Linux, install musl
         if: matrix.os == 'linux'
@@ -97,7 +97,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Install Nim
         uses: iffy/install-nim@cceb6b4d10dcb1968575ac083d4981c0302fd00d
@@ -130,7 +130,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Install minisign
         run: ./.github/bin/linux-install-minisign

.github/workflows/fetch-configlet.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.runs-on }}
     steps:
       - name: Checkout
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Run fetch-configlet
         shell: bash

.github/workflows/lint-whitespace.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Check that every file has no trailing whitespace, and exactly one final newline
         run: ./.github/bin/lint-whitespace

.github/workflows/markdownlint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Run markdownlint
         uses: DavidAnson/markdownlint-cli2-action@05f32210e84442804257b2a6f20b273450ec8265

.github/workflows/shellcheck.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38

.github/workflows/tests.yml

@@ -35,7 +35,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
 
       - name: Configure the git user # Required to create a commit in our binary tests
         run: |