Dockerfile: Use libpcre2.

It's a modern library and is available in the source image as opposed to
libpcre3 which is no longer in
martenseemann/quic-network-simulator-endpoint:latest.

Author: thresheek

Dockerfile

@@ -2,7 +2,7 @@ FROM martenseemann/quic-network-simulator-endpoint:latest AS builder
 
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update
-RUN apt-get install -qy build-essential libpcre3 libpcre3-dev zlib1g zlib1g-dev curl git cmake ninja-build gnutls-bin iptables
+RUN apt-get install -qy build-essential libpcre2-dev zlib1g zlib1g-dev curl git cmake ninja-build gnutls-bin iptables
 
 RUN useradd nginx