Bump actions/checkout from 2 to 3 (#118)

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
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>
Co-authored-by: Andrei Kazakou <a.v.kazakou@gmail.com>

.github/workflows/codeql.yml

@@ -59,7 +59,7 @@ jobs:
           node-version: '16'
 
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Restore cache of Node.js project dependencies
         id: cache-node-modules

.github/workflows/validation.yml

@@ -12,7 +12,7 @@ jobs:
           node-version: '16'
 
       - name: Checkout source code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Restore cache of Node.js project dependencies
         id: cache-node-modules