Bump actions/checkout from 3 to 4 (#174)

Author: dependabot[bot]

.github/workflows/deploy.yaml

@@ -15,7 +15,7 @@ jobs:
     if: github.actor != 'dependabot[bot]'
     steps:
       - name: Checkout main
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0
 

.github/workflows/lint.yml

@@ -4,7 +4,7 @@ jobs:
     build:
         runs-on: ubuntu-latest
         steps:
-            - uses: actions/checkout@v3
+            - uses: actions/checkout@v4
             - uses: xt0rted/markdownlint-problem-matcher@v2
             - name: "Run Markdown linter"
               uses: docker://avtodev/markdown-lint:v1