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

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]>

.github/workflows/automerge.yaml

@@ -9,7 +9,7 @@ jobs:
     if: github.actor == 'dependabot[bot]'
     steps:
     -
-      uses: actions/checkout@v2
+      uses: actions/checkout@v4
     -
       uses: ahmadnassri/[email protected]
       with:

.github/workflows/pr.yaml

@@ -6,7 +6,7 @@ jobs:
     name: golang lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4
     - uses: hazcod/action-golangci-lint@master
       with:
         github_token: ${{ secrets.GITHUB_TOKEN }}
@@ -16,7 +16,7 @@ jobs:
     name: dockerfile lint
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4
     - name: hadolint
       uses: burdzwastaken/[email protected]
       env:
@@ -27,7 +27,7 @@ jobs:
     name: docker build
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4
     - name: extract tag
       id: vars
       run: echo ::set-output name=nginx_version::$(grep '^FROM nginx' Dockerfile  | cut -d ' ' -f 2 | cut -d ':' -f 2)
@@ -38,7 +38,7 @@ jobs:
     name: docker security scan
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.3.4
+    - uses: actions/checkout@v4
     - name: docker build
       run: docker build . --file Dockerfile --tag image
     - name: cached scan db

.github/workflows/publish.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - 
-      uses: actions/checkout@v2.3.4
+      uses: actions/checkout@v4
     - 
       uses: go-semantic-release/action@v1
       id: version