Update woodpecker

.woodpecker.yml

@@ -1,22 +1,21 @@
 pipeline:
-  before_script:
+  unit_tests:
-    image: python:3.9
+    image: mquade/poetry:3.9-1.1.11
     commands:
-      - pip install poetry
       - poetry config virtualenvs.create false
       - poetry install
-
-  unit_tests:
-    image: python:3.9
-    commands:
       - pytest
 
   code_lint:
-    image: python:3.9
+    image: mquade/poetry:3.9-1.1.11
     commands:
+      - poetry config virtualenvs.create false
+      - poetry install
       - black .
 
   static_analysis:
-    image: python:3.9
+    image: mquade/poetry:3.9-1.1.11
     commands:
+      - poetry config virtualenvs.create false
+      - poetry install
       - mypy .