Update GitHub actions to v6 (#129)

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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -24,7 +24,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install tox
         run: pipx install tox
       - name: Run linters
@@ -36,7 +36,7 @@ jobs:
     timeout-minutes: 5
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install tox
         run: pipx install tox
       - name: Run tests
@@ -71,7 +71,7 @@ jobs:
     timeout-minutes: 120
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup operator environment
         # TODO: Replace with custom image on self-hosted runner
         uses: charmed-kubernetes/actions-operator@main
@@ -83,7 +83,7 @@ jobs:
           microk8s-group: snap_microk8s
           microk8s-addons: "rbac hostpath-storage dns minio"
       - name: Download packed charm(s)
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           pattern: ${{ needs.build.outputs.artifact-prefix }}-*
           merge-multiple: true

.github/workflows/release.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Extract branch metadata
         shell: bash
@@ -60,7 +60,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Release any bumped charm libs

.github/workflows/tiobe_scan.yaml

@@ -17,7 +17,7 @@ jobs:
     timeout-minutes: 60
     steps:
       - name: Checkout the project
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install system dependencies
         run: sudo apt-get update && sudo apt-get install -y python3-venv