docker: update to ocrd==3.3.0

Author: Robert Sachunsky

Makefile

@@ -28,7 +28,7 @@ PYTEST_ARGS =
 
 # Docker container tag
 DOCKER_TAG = 'ocrd/tesserocr'
-DOCKER_BASE_IMAGE = docker.io/ocrd/core:v3.1.0
+DOCKER_BASE_IMAGE = docker.io/ocrd/core:v3.3.0
 
 help:
 	@echo ""