tooling: switch to actions/checkout@v5

Author: cagix

.github/workflows/test_suite.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - name: Pre Clean
         working-directory: ./c-runtime
         run: make clean
@@ -32,7 +32,7 @@ jobs:
       runs-on: ${{ matrix.os }}
       steps:
           - name: Checkout
-            uses: actions/checkout@v4
+            uses: actions/checkout@v5
           - name: Set up JDK 21
             uses: actions/setup-java@v4
             with: