[gh-actions](deps): Bump actions/checkout from 5 to 6

.github/workflows/lint.yml

@@ -10,7 +10,7 @@ jobs:
 
     steps:
     - name: Set up environment
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:  # no need for the history
         fetch-depth: 1
     - name: Set up Python

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
       auto-version: ${{ steps.auto-version.outputs.version }}
     steps:
       - name: Checkout source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # A full checkout is required so that auto will have access to tag
           # information.
@@ -49,7 +49,7 @@ jobs:
           git config --global user.name "DANDI Bot"
 
       - name: Checkout source
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           path: dandischema
@@ -75,7 +75,7 @@ jobs:
         working-directory: dandischema
 
       - name: Checkout dandi/schema
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dandi/schema
           path: schema

.github/workflows/test-dandi-cli.yml

@@ -79,7 +79,7 @@ jobs:
         run: echo DANDI_DEVEL=1 >> "$GITHUB_ENV"
 
       - name: Check out dandischema
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Fetch all commits so that versioningit will return something
           # compatible with semantic-version

.github/workflows/test-nonetwork.yml

@@ -25,7 +25,7 @@ jobs:
           - '3.12'
     steps:
       - name: Set up environment
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # Fetch all commits so that versioningit will return something
           # compatible with semantic-version

.github/workflows/test-schema.yml

@@ -11,7 +11,7 @@ jobs:
     if: contains(github.event.pull_request.labels.*.name, 'release')
     steps:
       - name: Checkout this repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Need history for `git describe`
           path: dandischema
@@ -26,7 +26,7 @@ jobs:
         working-directory: dandischema
 
       - name: Checkout dandi/schema
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: dandi/schema
           path: schema

.github/workflows/test.yml

@@ -37,7 +37,7 @@ jobs:
             instance_name: EMBER-DANDI
     steps:
     - name: Set up environment
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # Fetch all commits so that versioningit will return something
         # compatible with semantic-version

.github/workflows/typing.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0