Bump actions/checkout from 2 to 3

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] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-pkgs.yml

@@ -19,7 +19,7 @@ jobs:
       run: |
         sudo apt-get update
         sudo apt-get install rpmlint
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         # Get all branches and tags so the latest tag can be found for VERSION
         fetch-depth: 0

.github/workflows/unit-test.yml

@@ -10,7 +10,7 @@ jobs:
         python-version: ['2.x', '3.x']
     name: Python ${{ matrix.python-version }} test
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Python
       uses: actions/setup-python@v2
       with: