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/generate-docs-for-dbt-core.yml

@@ -63,7 +63,7 @@ jobs:
 
     steps:
       - name: Checkout dbt-docs repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: upload changelog artifacts
         id: retrieve_changelogs
@@ -94,7 +94,7 @@ jobs:
     steps:
 
       - name: Checkout dbt-docs repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Update submodules
         run: git submodule update --init --recursive 
@@ -136,7 +136,7 @@ jobs:
 
     steps:
       - name: Check out dbt-core main branch
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: dbt-labs/dbt-core
           ref: main
@@ -195,7 +195,7 @@ jobs:
 
     steps:
       - name: Checkout dbt-docs repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: dbt-labs/dbt-docs # redundant but calling it out for clarity
 

.github/workflows/generate-index.yml

@@ -48,7 +48,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout dbt-docs repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Update submodules
         run: git submodule update --init --recursive 

.github/workflows/test.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3