bump checkout action to v4

Author: exaexa

.github/workflows/ci.yml

@@ -24,7 +24,7 @@ jobs:
         arch:
           - x64
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@v1
         with:
           version: ${{ matrix.version }}

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@latest
       - uses: julia-actions/cache@v1
       - name: Install dependencies

.github/workflows/pr-format.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Clone the repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Checkout the pull request code # this checks out the actual branch so that one can commit into it
         if: github.event_name == 'issue_comment'
         env: