chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/mkdocs.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install asdf
         uses: asdf-vm/actions/setup@v1

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   tests-pre-commit:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install asdf
         uses: asdf-vm/actions/setup@v1
@@ -57,7 +57,7 @@ jobs:
   commitlint:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: wagoid/commitlint-github-action@v2