Bump actions/checkout from 2 to 3 (cosmos#300)

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/lint.yml

@@ -11,7 +11,7 @@ jobs:
     name: lint
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v3.1.0
         with:

.github/workflows/pending-changelog-checker.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
       - name: "Checkout source code"
-        uses: "actions/checkout@v2"
+        uses: "actions/checkout@v3"
       - name: Changelog check
         uses: celestiaorg/changelog-checker@v1
         with:

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
 
     - name: Set up Go
       uses: actions/setup-go@v2