Update actions/checkout action to v4

.github/workflows/build.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Yarn cache
         uses: actions/setup-node@v3
         with:

.github/workflows/e2e.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out test private repo
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: vector-im/static-call-participant
           ref: refs/heads/main

.github/workflows/lint.yaml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Yarn cache
         uses: actions/setup-node@v3
         with:

.github/workflows/publish.yaml

@@ -23,7 +23,7 @@ jobs:
         run: echo "unix_time=$(date +'%s')" >> $GITHUB_OUTPUT
 
       - name: Check it out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Log in to container registry
         uses: docker/login-action@b4bedf8053341df3b5a9f9e0f2cf4e79e27360c6

.github/workflows/test.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Yarn cache
         uses: actions/setup-node@v3
         with: