⬆️ Update actions/checkout action to v6 (#1288)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/deploy-webapp.yml

@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set Up Python
         uses: actions/setup-python@v5

.github/workflows/hassfest.yaml

@@ -11,5 +11,5 @@ jobs:
   validate_hassfest:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@v4.2.2"
+      - uses: "actions/checkout@v6.0.0"
       - uses: home-assistant/actions/hassfest@master

.github/workflows/install_dependencies/action.yml

@@ -14,14 +14,14 @@ runs:
   using: "composite"
   steps:
     - name: Check out code from GitHub
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         repository: ${{ github.repository }}
         ref: ${{ github.ref }}
         persist-credentials: false
         fetch-depth: 0
     - name: Check out code from GitHub
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         repository: home-assistant/core
         path: core

.github/workflows/main-to-master-sync.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         ref: main
         fetch-depth: 0

.github/workflows/pre-commit.yaml

@@ -9,6 +9,6 @@ jobs:
   pre-commit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-python@v5
     - uses: pre-commit/action@v3.0.1

.github/workflows/pytest.yaml

@@ -42,7 +42,7 @@ jobs:
             python-version: "3.13"
     steps:
       - name: Check out code from GitHub
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Home Assistant
         uses: ./.github/workflows/install_dependencies

.github/workflows/update-readme.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code from GitHub
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Install Home Assistant
         uses: ./.github/workflows/install_dependencies

.github/workflows/validate.yml

@@ -11,7 +11,7 @@ jobs:
   validate_hacs:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@v4"
+      - uses: "actions/checkout@v6"
       - name: HACS validation
         uses: "hacs/action@main"
         with: