use github native path conditions instead of external action

.github/workflows/testupdatemap.yml

@@ -3,7 +3,9 @@
 name: rebuild map
 on:
   pull_request:
+    paths: '*.py'
   push:
+    paths: '*.py'
   schedule:
     - cron: "20 5 * * 5"
 jobs:
@@ -11,23 +13,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: check changed files
-        uses: tj-actions/verify-changed-files@v11.1
-        id: verify-changed-files
-        with:
-          files: |
-             fqcn-fixer.py
       - name: Set up Python 3.9
-        if: steps.verify-changed-files.outputs.files_changed == 'true'
         uses: actions/setup-python@v2
         with:
           python-version: 3.9
       - name: install pyyaml
-        if: steps.verify-changed-files.outputs.files_changed == 'true'
         run: |
           python -m pip install --upgrade pip
           pip install pyyaml
       - name: rebuild fqcn map
-        if: steps.verify-changed-files.outputs.files_changed == 'true'
         run: |
           ./fqcn-fixer.py -f example.yml -u