ci: bump actions/checkout from 2.4.0 to 3 (#470)

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

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
     concurrency:
       group: ${{ github.workflow }}-${{ github.ref }}
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
         with:
           fetch-depth: 0
 
@@ -139,7 +139,7 @@ jobs:
     timeout-minutes: 2
     if: ${{ github.event_name == 'push' || github.event_name == 'pull_request' }}
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - uses: actions/[email protected]
         with:
@@ -160,7 +160,7 @@ jobs:
           - true
           - false
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
 
       - uses: actions/setup-go@v2
         with:

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-18.04
     timeout-minutes: 2
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v3
       - uses: peaceiris/workflows/[email protected]
         with:
           draft: ''