Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/checks.yml

@@ -10,7 +10,7 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+    - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       with:
         persist-credentials: false
     - uses: DeterminateSystems/nix-installer-action@main

.github/workflows/hassfest.yml

@@ -12,7 +12,7 @@ jobs:
   validate:
     runs-on: "ubuntu-latest"
     steps:
-      - uses: "actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd" # v5
+      - uses: "actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3" # v6
         with:
           persist-credentials: false
       - uses: "home-assistant/actions/hassfest@master"