Update actions/checkout action to v4 (#51)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
 
       steps:
          -  name: Checkout the repo
-            uses: actions/checkout@v2
+            uses: actions/checkout@v4
             with:
                fetch-depth: 0
 

.github/workflows/release.yml

@@ -9,7 +9,7 @@ jobs:
 
     steps:
       - name: Checkout the repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0