Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/benchmark.yml

@@ -20,7 +20,7 @@ jobs:
       EXNAME: larod-test
       EAPNAME: larod_test
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Reboot device to clear logs
         run: |

.github/workflows/linter.yml

@@ -9,7 +9,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: super-linter/super-linter/slim@v8