build(deps): 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](actions/checkout@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>

Author: dependabot[bot]

.github/workflows/check-license-header.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout Branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Validate License Headers
         run: npm run license:check

.github/workflows/deploy-all-production-accounts.yml

@@ -26,7 +26,7 @@ jobs:
     outputs:
       target_helplines: ${{ steps.determine-target-helplines.outputs.target_helplines }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v5
         with:

.github/workflows/deploy-all-staging-accounts.yml

@@ -26,7 +26,7 @@ jobs:
     outputs:
       target_helplines: ${{ steps.determine-target-helplines.outputs.target_helplines }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Configure AWS credentials
         uses: aws-actions/configure-aws-credentials@v5
         with:

.github/workflows/deploy-multiple-accounts.yml

@@ -53,7 +53,7 @@ jobs:
       TWILIO_SSM_PREFIX: ${{matrix.environment_code}}_TWILIO_${{matrix.helpline_code}}
       FULL_ENVIRONMENT_NAME: ${{matrix.environment_code == 'PROD' && 'production' || matrix.environment_code == 'STG' && 'staging' || 'development'}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use Node.js
         uses: actions/setup-node@v6
         with:

.github/workflows/raise-rc-merge-pr.yml

@@ -26,7 +26,7 @@ jobs:
     outputs:
       found_branches: ${{steps.find_branches.outputs.found-branches}}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           sparse-checkout-cone-mode: false
           sparse-checkout: |
@@ -50,7 +50,7 @@ jobs:
       matrix:
         target-branch: ${{ fromJSON(needs.find_target_branches.outputs.found_branches) }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set merge branch name
         run: |
           github_sha_hash=${{ github.sha }}  

.github/workflows/serverless-ci.yml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout Branch
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:

.github/workflows/serverless-pre-release-qa.yml

@@ -44,7 +44,7 @@ jobs:
 
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Use Node.js
         uses: actions/setup-node@v6
         with:
@@ -96,7 +96,7 @@ jobs:
 
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Create pre release
         uses: techmatters/flex-plugins/.github/actions/generate-pre-release@master

.github/workflows/serverless-production-release.yml

@@ -33,7 +33,7 @@ jobs:
 
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Create production release
         uses: techmatters/flex-plugins/.github/actions/generate-production-release@master