Merge pull request #224 from haskell-actions/chungyc-patch-1

Update version of actions/checkout to v4 in example.

Author: chungyc

README.md

@@ -18,7 +18,7 @@ jobs:
       # Needed to upload results to GitHub code scanning.
       security-events: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: haskell-actions/hlint-scan@v1
 ```