Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/lint.yml

@@ -19,7 +19,7 @@ jobs:
       DEVELOPER_DIR: /Applications/Xcode_16.3.app/Contents/Developer
 
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
       with:
         submodules: true
 
@@ -36,7 +36,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
     - uses: reviewdog/action-actionlint@f00ad0691526c10be4021a91b2510f0a769b14d0 # v1.68.0
       with: