Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...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>

.github/workflows/master.yml

@@ -28,7 +28,7 @@ jobs:
           go-version: 1.21.x
 
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # cache go modules
       - uses: actions/cache@v3

.github/workflows/semgrep.yml

@@ -21,7 +21,7 @@ jobs:
     if: (github.actor != 'dependabot[bot]')
     steps:
       # Fetch project source
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: returntocorp/semgrep-action@v1
         with: