chore(deps): bump actions/checkout from 2 to 3 (#441)

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>

.github/workflows/backport.yml

@@ -20,7 +20,7 @@ jobs:
         contains(github.event.comment.body, '/backport')
       )
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Create backport PRs
         uses: zeebe-io/backport-action@v0.0.8
         with:

.github/workflows/build-docs.yaml

@@ -8,7 +8,7 @@ jobs:
   build-docs:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v1
         with:
           node-version: 12

.github/workflows/build-maven.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v2
+      uses: actions/checkout@v3
     - name: Java setup
       uses: actions/setup-java@v1
       with:

.github/workflows/publish-docs.yaml

@@ -14,7 +14,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-node@v1
         with:
           node-version: 12