Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
       id: vars
       run: echo "{tag}=${GITHUB_REF:10}" >> $GITHUB_OUTPUT
     - name: Clone repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
       with:
         ref: ${{ steps.vars.outputs.tag }}
     - name: Build and publish module

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Clone repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Run unit tests
       uses: puppets-epic-show-theatre/action-pdk-test-unit@v1
@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Clone repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v6
 
     - name: Run PDK validate
       uses: puppets-epic-show-theatre/action-pdk-validate@v1