chore(deps): update actions/checkout action to v6 (#6)

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

Author: renovate[bot]

.github/workflows/megalinter.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-24.04
     if: github.event.action != 'closed'
     steps:
-      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
         with:
           fetch-depth: 0