Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/danger.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Flutter
         uses: ./.github/actions/setup-flutter

.github/workflows/pr.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up Flutter
         uses: ./.github/actions/setup-flutter

.github/workflows/release_flutter_app.yaml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up tag
         uses: ./.github/actions/setup-tag
@@ -37,7 +37,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Set up tag
         uses: ./.github/actions/setup-tag