Update to checkout v6 action

GitHub Runner version >= 2.239.0 is required.

Workflow `Set up job` runs do indicate that runner version is used:

  > Current runner version: '2.329.0'

Author: richardkmichael

.github/workflows/build.yml

@@ -30,7 +30,7 @@ jobs:
           git config --global core.autocrlf false
           git config --global core.eol lf
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with:
@@ -63,7 +63,7 @@ jobs:
     continue-on-error: true
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with:
@@ -96,7 +96,7 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libwoff1
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         id: setup_node

.github/workflows/claude.yml

@@ -28,7 +28,7 @@ jobs:
       actions: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/cli_tests.yml

@@ -15,7 +15,7 @@ jobs:
       run:
         working-directory: ./cli
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Node.js
         uses: actions/setup-node@v6

.github/workflows/release.yml

@@ -19,7 +19,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with:
@@ -46,7 +46,7 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Log in to the Container registry
         uses: docker/login-action@v3