build: Update the checkout@ action

checkout@v3 uses Node16.js, which is no longer supported.

Signed-off-by: Chuck Lever <[email protected]>

Author: chucklever

.github/workflows/makefile.yml

@@ -16,7 +16,7 @@ jobs:
           - linux/arm64
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Install dependencies
       run: |