chore(deps): bump actions/checkout from 3 to 4

Dependabot couldn't find the original pull request head commit, 372bd00.

Author: dependabot[bot]

.github/workflows/backend.yaml

@@ -13,7 +13,7 @@ jobs:
     name: "Lint"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set UID
         run: echo "UID=$(id --user)" > .env
       - name: Lint the backend code
@@ -23,7 +23,7 @@ jobs:
     name: "Test"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set UID
         run: echo "UID=$(id --user)" > .env
       - name: Build the containers

.github/workflows/frontend.yaml

@@ -18,7 +18,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Node
         uses: actions/setup-node@v3
         with:
@@ -36,7 +36,7 @@ jobs:
     timeout-minutes: 10
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Node
         uses: actions/setup-node@v3
         with: