Update file Dockerfile

Dockerfile

@@ -2,7 +2,7 @@ FROM debian:testing
 
 RUN export LC_ALL=C.UTF-8
 RUN export LANG=C.UTF-8
-RUN apt-get -yq update && apt-get -yq install pngquant unpaper python3 python3-pip exempi qpdf ghostscript git autotools-dev automake libtool libleptonica-dev zlibc zlib1g zlib1g-dev wget
+RUN apt-get -yq update && apt-get -yq install pngquant unpaper python3 python3-pip exempi qpdf ghostscript git autotools-dev automake libtool libleptonica-dev zlib1g zlib1g-dev wget
 
 RUN apt-get -yq install tesseract-ocr tesseract-ocr-deu
 RUN pip3 install ocrmypdf