Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/python-unittest.yml

@@ -9,7 +9,7 @@ jobs:
   python-unittests:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
     - name: Install Poetry
       uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a # v1

.github/workflows/weekly_csv_release.yml

@@ -10,7 +10,7 @@ jobs:
   generate_and_release_csv:
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
         - name: Install Poetry
           uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a # v1