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

Author: renovate[bot]

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: "./.github/actions/setup-project"
 

.github/workflows/pre-commit.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: './.github/actions/setup-project'
 

.github/workflows/publish.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: './.github/actions/setup-project'
 

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
       py-versions: ${{ steps.supported-versions.outputs.py-versions }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: './.github/actions/setup-project'
 
@@ -33,7 +33,7 @@ jobs:
         py-version: ${{ fromJson(needs.versions.outputs.py-versions) }}
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: './.github/actions/setup-project'
         with: