Bump actions/checkout from 2 to 3 (#515)

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)

Author: dependabot[bot]

.github/workflows/container-tests.yml

@@ -12,7 +12,7 @@ jobs:
       && contains(fromJson('["OWNER", "MEMBER"]'), github.event.comment.author_association)
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           ref: "refs/pull/${{ github.event.issue.number }}/head"
           submodules: true

.github/workflows/openshift-tests.yml

@@ -12,7 +12,7 @@ jobs:
       && contains(fromJson('["OWNER", "MEMBER"]'), github.event.comment.author_association)
     steps:
       - name: Checkout repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           ref: "refs/pull/${{ github.event.issue.number }}/head"
           submodules: true