Revert wrk to version 4.1.0 (#7852)

toolset/wrk/wrk.dockerfile

@@ -3,7 +3,7 @@ FROM buildpack-deps:bionic
 RUN apt-get update && apt-get install -yqq libluajit-5.1-dev libssl-dev luajit
 
 WORKDIR /wrk
-RUN curl -sL https://github.com/wg/wrk/archive/4.2.0.tar.gz | tar xz --strip-components=1
+RUN curl -sL https://github.com/wg/wrk/archive/4.1.0.tar.gz | tar xz --strip-components=1
 ENV LDFLAGS="-O3 -march=native -mtune=native -flto"
 ENV CFLAGS="-I /usr/include/luajit-2.1 $LDFLAGS"
 RUN make WITH_LUAJIT=/usr WITH_OPENSSL=/usr -j "$(nproc)"