Update actions/checkout action to v4

Change-Id: Ib0bd4b04d1c768d7412b5eb88e1473a8c6743590
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 150e249..4277381 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,7 +10,7 @@
     runs-on: ubuntu-latest
     steps:
       - name: Checkout master
-        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
         with:
           fetch-depth: 0