chore(ci): bump actions/checkout from 2 to 4 (#563)

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/ci.yaml

@@ -11,7 +11,7 @@ jobs:
     name: lint
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
           go-version: '1.22'
@@ -26,7 +26,7 @@ jobs:
     name: diff
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v5

.github/workflows/e2e.yaml

@@ -35,7 +35,7 @@ jobs:
     name: Kubernetes
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v5

.github/workflows/helm.yaml

@@ -12,7 +12,7 @@ jobs:
     name: diff
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - run: make -C charts/kamaji docs
@@ -21,7 +21,7 @@ jobs:
   lint:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: azure/setup-helm@v4
         with:
           version: 3.3.4
@@ -35,7 +35,7 @@ jobs:
     if: startsWith(github.ref, 'refs/tags/helm-v')
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Publish Helm chart
         uses: stefanprodan/helm-gh-pages@master
         with:

.github/workflows/ko-build.yml

@@ -9,7 +9,7 @@ jobs:
   ko:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-go@v5