chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/main.yml

@@ -23,7 +23,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Black Code Formatter
         # You may pin to the exact commit or the version.

.github/workflows/python-publish.yml

@@ -8,7 +8,7 @@ jobs:
   deploy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4.3.1
+      - uses: actions/checkout@v6.0.3
       - name: Set up Python
         uses: actions/setup-python@v4.9.1
         with: