use full depth fetch instead of unshallow

.woodpecker/test.yml

@@ -16,8 +16,7 @@ steps:
   fetch:
     image: docker.io/library/python:3.11
     commands:
-      - >
-        [ -f "$(git rev-parse --is-shallow-repository)" ] && git fetch --unshallow || true
+      - git fetch --depth=2147483647
 
   pytest:
     image: ${PYTHON_VERSION}