chore(internal): use actions/checkout@v4 for codeflow (#1368)

Author: stainless-bot

.github/workflows/create-releases.yml

@@ -14,7 +14,7 @@ jobs:
     environment: publish
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - uses: stainless-api/trigger-release-please@v1
         id: release

.github/workflows/publish-pypi.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Install Rye
         run: |

.github/workflows/release-doctor.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.repository == 'openai/openai-python' && (github.event_name == 'push' || github.event_name == 'workflow_dispatch' || startsWith(github.head_ref, 'release-please') || github.head_ref == 'next')
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Check release environment
         run: |