Replace python-dev with python3-dev (python-dev is an older naming convention, typically for Python 2)

Author: MikaKerman

Dockerfile

@@ -8,7 +8,7 @@ RUN chmod 777 .
 
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \
-    python-dev \
+    python3-dev \
     libsasl2-dev \
     && apt-get clean \
     && rm -rf \