Update actions/checkout to v4 (#107)

* Update actions/checkout to v4

* update CHANGELOG.md

* fix .github/workflows/check_changelog.yml

.github/workflows/check_changelog.yml

@@ -6,7 +6,9 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
     - name: Check that CHANGELOG is touched
       run: |
         cat $GITHUB_EVENT_PATH | jq .pull_request.title |  grep -i '\[\(\(changelog skip\)\|\(ci skip\)\)\]' ||  git diff remotes/origin/${{ github.base_ref }} --name-only | grep CHANGELOG.md

.github/workflows/ci.yml

@@ -21,7 +21,7 @@ jobs:
           - head
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## Main
 
 - Migrate CI from Travis CI to GitHub Actions (#101)
+- Update actions/checkout to v4 (#107)
 
 ## 0.3.1