build: bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -28,7 +28,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup
@@ -59,7 +59,7 @@ jobs:
       - test
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup
@@ -84,7 +84,7 @@ jobs:
     if: always() && vars.DISCORD_WEBHOOK_ID
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup

.github/workflows/pr.yml

@@ -27,7 +27,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup

.github/workflows/release.yml

@@ -15,7 +15,7 @@ jobs:
     if: vars.DISCORD_RELEASE_WEBHOOK_ID || vars.DISCORD_WEBHOOK_ID
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup

.github/workflows/tag.yml

@@ -19,7 +19,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup
@@ -54,7 +54,7 @@ jobs:
     if: always() && vars.DISCORD_WEBHOOK_ID
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Common Setup
         uses: ./.github/actions/common-setup