ci(action): update actions/checkout action to v4.2.1

Author: isn-renovate[bot]

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
       - name: Checkout project
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
         with:
           persist-credentials: false
 

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
       - name: Checkout project
-        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
+        uses: actions/checkout@eef61447b9ff4aafe5dcd4e0bbf5d482be7e7871 # v4.2.1
         with:
           fetch-depth: 0