⬆️ Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/linting.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⤵️ Check out code from GitHub
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: 🏗 Set up Poetry
         run: pipx install poetry
       - name: 🏗 Set up Python ${{ env.DEFAULT_PYTHON }}
@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⤵️ Check out code from GitHub
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: 🏗 Set up Poetry
         run: pipx install poetry
       - name: 🏗 Set up Python ${{ env.DEFAULT_PYTHON }}
@@ -80,7 +80,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⤵️ Check out code from GitHub
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: 🏗 Set up Poetry
         run: pipx install poetry
       - name: 🏗 Set up Python ${{ env.DEFAULT_PYTHON }}
@@ -103,7 +103,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: ⤵️ Check out code from GitHub
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: 🏗 Set up Poetry
         run: pipx install poetry
       - name: 🏗 Set up Python ${{ env.DEFAULT_PYTHON }}

.github/workflows/sync-labels.yaml

@@ -18,7 +18,7 @@ jobs:
       pull-requests: write
     steps:
       - name: ⤵️ Check out code from GitHub
-        uses: actions/checkout@v4.3.0
+        uses: actions/checkout@v6.0.0
       - name: 🚀 Run Label Syncer
         uses: micnncim/action-label-syncer@v1.3.0
         env: