Update GitHub Actions to Node 24 compatible versions (#143)

* Update GitHub Actions to Node 24 compatible versions

GitHub is deprecating Node 20 on Actions runners (EOL April 2026).
Updated actions to their latest major versions with Node 24 support:
- actions/checkout v4 → v6
- Added persist-credentials: true for check-codegen workflow
  (checkout@v6 no longer persists credentials by default,
  needed for git submodule update --recursive --remote)

* Remove CLAUDE.md from branch

Author: Denis-Averin

.github/workflows/check-codegen.yml

@@ -13,9 +13,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive
+          persist-credentials: true
 
       - name: Check all submodules up-to-date
         run: |
@@ -26,6 +27,6 @@ jobs:
     runs-on: ubuntu-latest
     needs: [check-submodules]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Check existing swagger specification is up-to-date
         run: curl https://api.aspose.cloud/v4.0/barcode/swagger/spec | diff --strip-trailing-cr -y --suppress-common-lines spec/aspose-barcode-cloud.json -

.github/workflows/check-urls.yml

@@ -16,7 +16,7 @@ jobs:
   check-urls:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: recursive