Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/linting.yml

@@ -8,7 +8,7 @@
       runs-on: ubuntu-latest
       steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup Node
         uses: actions/setup-node@v3
@@ -37,7 +37,7 @@
       runs-on: ubuntu-latest
       steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
 
       - name: Setup Node
         uses: actions/setup-node@v3

.github/workflows/terraform.yml

@@ -20,7 +20,7 @@ jobs:
     if: github.event_name == 'pull_request'
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Setup Node
       uses: actions/setup-node@v3
@@ -136,7 +136,7 @@ jobs:
         GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
 
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
       with:
         ref: ${{ fromJson(steps.get-branch.outputs.data).head.ref }}
 
@@ -196,7 +196,7 @@ jobs:
       url: https://thadmin-staging.technicie.nl
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Setup Node
       uses: actions/setup-node@v3
@@ -244,7 +244,7 @@ jobs:
       url: https://thadmin.thalia.nu
     steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Setup Node
       uses: actions/setup-node@v3