docs: update references to actions/checkout to v4

| datasource  | package          | from   | to     |
| ----------- | ---------------- | ------ | ------ |
| github-tags | actions/checkout | v3.6.0 | v4.1.1 |
| github-tags | actions/checkout | v3.5.3 | v4.1.1 |

README.md

@@ -99,7 +99,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.5.3
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -129,7 +129,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.5.3
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -181,7 +181,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -198,7 +198,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -220,7 +220,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -237,7 +237,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -269,7 +269,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with:
@@ -324,7 +324,7 @@ jobs:
           app_id: ${{ secrets.app_id }}
 
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
 
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
@@ -348,7 +348,7 @@ For example if you wish to pass through some credentials for a [host rule](https
        runs-on: ubuntu-latest
        steps:
          - name: Checkout
-           uses: actions/checkout@v3.6.0
+           uses: actions/checkout@v4.1.1
          - name: Self-hosted Renovate
            uses: renovatebot/github-action@v39.2.4
            with:
@@ -385,7 +385,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4.1.1
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@v39.2.4
         with: