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

Author: renovate[bot]

.github/workflows/docs.yaml

@@ -27,7 +27,7 @@ jobs:
     name: Build
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
     - name: Setup Nix Environment
       uses: ./.github/actions/setup-nix
       with:
@@ -41,7 +41,7 @@ jobs:
     name: Spellcheck
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
     - name: Setup Nix Environment
       uses: ./.github/actions/setup-nix
       with:
@@ -58,7 +58,7 @@ jobs:
     if: github.base_ref == 'main'
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
     - name: Setup Nix Environment
       uses: ./.github/actions/setup-nix
       with: