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]>

.github/workflows/docs.yaml

@@ -7,7 +7,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
           python-version: 3.x

.github/workflows/nightly-install.yaml

@@ -25,7 +25,7 @@ jobs:
       INSTALL_RKE2_CHANNEL: ${{ matrix.channel }}
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with: {fetch-depth: 1}
       - name: "Vagrant Cache"
         uses: actions/cache@v3

.github/workflows/spellcheck.yaml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 1
     - name: Set up Python 🐍

.github/workflows/updatecli.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.ref == 'refs/heads/master'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Install Go
         uses: actions/setup-go@v4