Bump actions/checkout from 3.0.2 to 3.1.0 (#89)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/2541b1294d2704b0964813337f33b291d3f8596b...93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/validate.yml

diff --git a/.github/workflows/validate.yml b/.github/workflows/validate.yml
index 59847a7..fb16bf4 100644
--- a/.github/workflows/validate.yml
+++ b/.github/workflows/validate.yml
@@ -21,7 +21,7 @@
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
+      - uses: actions/checkout@93ea575cb5d8a053eaa0ac8fa3b40d7e05a33cc8
 
       - name: Check for sources
         run: |