build(deps): bump actions/checkout from 3.6.0 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@f43a0e5...3df4ab1)

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

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

.github/workflows/exercises.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout exercism/nim
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - name: Install Nim (devel)
         if: matrix.nim == 'devel'

.github/workflows/lint-whitespace.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - 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-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - name: Run markdownlint
         uses: DavidAnson/markdownlint-cli2-action@3aaa38e446fbd2c288af4291aa0f55d64651050f

.github/workflows/shellcheck.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout
-        uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38

.github/workflows/uuids.yml

@@ -8,7 +8,7 @@ jobs:
       NIM_VERSION: '2.0.0'
 
     steps:
-    - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+    - uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac
 
     - name: Get the versions of the installed GCC and OpenSSL
       run: |