chore(deps): update actions/checkout action to v4

.github/workflows/branch_automation.yaml

@@ -16,7 +16,7 @@ jobs:
     env:
       KUBEFLOW_BOT_TOKEN: ${{ secrets.KUBEFLOW_BOT_TOKEN }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: canonical/bundle-kubeflow
           fetch-depth: 0

.github/workflows/on_pull_request.yaml

@@ -8,23 +8,23 @@ jobs:
     name: Lint Code
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: sudo apt update && sudo apt install tox
       - run: tox -e lint
 
   branch_creation_tests:
     name: Branch Creation Script Tests
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: sudo apt update && sudo apt install tox
       - run: tox -e test_branch_creation
 
   batch_release_charms_tests:
     name: Batch Release Charms Script Tests
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: sudo apt update && sudo apt install tox
       - run: tox -e test_batch_release_charms
 
@@ -35,7 +35,7 @@ jobs:
     steps:
     # Set things up like a charm would.  Get juju and microk8s
     - name: Check out repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup operator environment
       uses: charmed-kubernetes/actions-operator@main

actions/contributing-update/action.yaml

@@ -17,7 +17,7 @@ inputs:
 runs:
   using: 'composite'
   steps:
-    - uses: 'actions/checkout@v3'
+    - uses: 'actions/checkout@v4'
     - name: 'Make temporary dir for this job'
       shell: bash
       run: |

actions/dump-charm-debug-artifacts/action.yml

@@ -4,7 +4,7 @@ runs:
   using: 'composite'
   steps:
     - name: Check out repo
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     # Setup
 

actions/get-charm-paths/action.yml

@@ -19,7 +19,7 @@ outputs:
 runs:
   using: 'composite'
   steps:
-    - uses: 'actions/checkout@v3'
+    - uses: 'actions/checkout@v4'
     - name: 'Get paths for all charms in repo'
       id: get-charm-paths
       shell: bash