Update a few dependent actions. (#14)

Author: rolfbjarne

action.yml

@@ -46,7 +46,7 @@ runs:
   using: "composite"
   steps:
     - name: 'Checkout repo'
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
         repository: ${{ github.event.pull_request.head.repo.full_name }}
@@ -134,7 +134,7 @@ runs:
 
     - id: upload
       name: 'Upload patch'
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: ${{ inputs.artifact }}
         path: autoformat/