Update actions/checkout action to v4

.github/workflows/danger.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup environment
         run: 

.github/workflows/integration-tests.yml

@@ -17,7 +17,7 @@ jobs:
       cancel-in-progress: false
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/cache@v4
         with:
@@ -62,7 +62,7 @@ jobs:
      
       - name: Checkout gh-pages branch (for perf stats)
         if: always()
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           ref: gh-pages
           path: gh-pages

.github/workflows/pr-build.yml

@@ -19,7 +19,7 @@ jobs:
       cancel-in-progress: true
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: actions/cache@v4
         with:

.github/workflows/translations-pr.yml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'element-hq/element-x-ios'
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup environment
         run: