chore(deps): bump actions/checkout from 2 to 4 (#242)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
   linters:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v4
         with:
           go-version: 1.18.x

.github/workflows/publiccode-yml-validation.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     name: publiccode.yml validation
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - uses: italia/publiccode-parser-action@v1
       with:
         publiccode: 'publiccode.yml'

.github/workflows/publish-staging-docker-image.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           go-version: 1.18.x
       -
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # All history, required for goreleaser
           fetch-depth: 0

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           go-version: 1.18.x
       -
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           # All history, required for goreleaser
           fetch-depth: 0

.github/workflows/spectral.yaml

@@ -11,7 +11,7 @@ jobs:
   spectral:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: curl https://italia.github.io/api-oas-checker/spectral-full.yml > .spectral.yml
 
       # Get additional module required by spectral-full

.github/workflows/tests-postgresql.yml

@@ -23,7 +23,7 @@ jobs:
           - 5432:5432
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v4
         with:
           go-version: 1.18.x

.github/workflows/tests-sqlite.yml

@@ -8,7 +8,7 @@ jobs:
   tests-sqlite:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v4
         with:
           go-version: 1.18.x