build(deps): bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...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] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
   supply-chain-audit:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Block compromised packages
         run: |
           echo "Scanning lockfiles for known malicious packages..."
@@ -31,7 +31,7 @@ jobs:
     needs: supply-chain-audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Use Node.js 20
         uses: actions/setup-node@v4
         with:
@@ -73,7 +73,7 @@ jobs:
     needs: supply-chain-audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Use Node.js 20
         uses: actions/setup-node@v4
         with:
@@ -101,7 +101,7 @@ jobs:
   env-docs-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Use Node.js 20
         uses: actions/setup-node@v4
         with:
@@ -112,7 +112,7 @@ jobs:
   contracts:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable

.github/workflows/codeql.yml

@@ -27,7 +27,7 @@ jobs:
         language: ["javascript-typescript"]
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Initialize CodeQL
         uses: github/codeql-action/init@v3

.github/workflows/deploy-staging.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set lowercase owner
         run: echo "OWNER_LC=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_ENV
@@ -124,7 +124,7 @@ jobs:
     environment: staging
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set lowercase owner
         run: echo "OWNER_LC=${GITHUB_REPOSITORY_OWNER,,}" >> $GITHUB_ENV

.github/workflows/loadtest.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Run k6 baseline load test
         uses: grafana/[email protected]