Removed python 3.9 tests from ci

.woodpecker.yml

@@ -1,17 +1,12 @@
-matrix:
-    PYTHON_VERSION:
-        - 3.8
-        - 3.9
-
 pipeline:
     test:
         # Alpine version doesn't have make
-        image: python:${PYTHON_VERSION}
+        image: python:3.8
         pull: true
         commands:
             - make test
 
     lint:
-        image: python:${PYTHON_VERSION}
+        image: python:3.8
         commands:
             - make lint