Bump actions/checkout from 2 to 4 (#669)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/backend.yml

@@ -17,7 +17,7 @@ jobs:
       backend: ${{ steps.filter.outputs.backend }}
       frontend: ${{ steps.filter.outputs.frontend }}
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v4
 
       - uses: dorny/paths-filter@v2
         id: filter
@@ -39,7 +39,7 @@ jobs:
         working-directory: backend
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
@@ -60,7 +60,7 @@ jobs:
         working-directory: backend
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v4
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
@@ -110,7 +110,7 @@ jobs:
           --health-retries 5
 
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v4
 
       - name: Install PostgreSQL client
         run: |

.github/workflows/frontend.yml

@@ -17,7 +17,7 @@ jobs:
       backend: ${{ steps.filter.outputs.backend }}
       frontend: ${{ steps.filter.outputs.frontend }}
     steps:
-      - uses: actions/checkout@v2.3.4
+      - uses: actions/checkout@v4
 
       - uses: dorny/paths-filter@v2
         id: filter
@@ -39,7 +39,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 7
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node_version }}
@@ -60,7 +60,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 7
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node_version }}