Fixed DNS utils package

Dockerfile

@@ -1,6 +1,6 @@
 FROM debian:10-slim
 RUN apt-get update && apt-get install -y apache2 \
-    curl netcat nmap openssl iputils-ping bind-utils \
+    curl netcat nmap openssl iputils-ping dnsutils \
     ntpdate \
     && apt-get clean
 CMD ["/bin/bash"]