Update actions/checkout action to v6

.github/workflows/automatic-calendar-version.yml

@@ -18,7 +18,7 @@ jobs:
     if: github.repository == 'element-hq/element-x-ios'
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup environment
         run: 

.github/workflows/danger.yml

@@ -16,7 +16,7 @@ jobs:
       cancel-in-progress: true
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Danger
         uses: danger/swift@2dc204311befdf33eae93dec92a1f059ca673425 #v3.22.0
         env:

.github/workflows/integration-tests.yml

@@ -18,7 +18,7 @@ jobs:
       cancel-in-progress: false
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/cache@v4
         with:

.github/workflows/translations-pr.yml

@@ -14,7 +14,7 @@ jobs:
     if: github.repository == 'element-hq/element-x-ios'
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup environment
         run: