build(deps): bump actions/checkout from 4.1.1 to 6.0.2

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.1 to 6.0.2.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@b4ffde6...de0fac2)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/action-run-semgrep.yaml

@@ -89,12 +89,12 @@ jobs:
       # Clone the invoker's repository.
       - if: ${{ !env.ACT }}
         name: Checkout Caller's Code
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       # Clone the custom semgrep rules (this GitHub repository).
       - if: ${{ !env.ACT }}
         name: Checkout Custom Semgrep Rules
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           # Unfortunately we cannot detect the GitHub repository, and git ref of
           # the invoked workflow (this file) in pull requests due to not having access

.github/workflows/test-rules.yaml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
       # Checks for syntax errors and runs 'p/semgrep-rule-lints'.
       - name: Validate Rules