fix(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/fossa.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install rust toolchain
         uses: actions-rs/toolchain@v1
         with:

.github/workflows/rust_security_audit.yml

@@ -8,7 +8,7 @@ jobs:
   security_audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions-rs/audit-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}