chore(github-actions): update actions/checkout action to v7 (#83)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out source repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           fetch-depth: 0 #full history
       - name: Set up Python

.github/workflows/lint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out source repository
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Set up Python
         uses: actions/setup-python@v6
         with: