Updated boost url for base docker container

Signed-off-by: Navya-Verma11 <118188894+Navya-Verma11@users.noreply.github.com>

Author: Navya-Verma11

Docker/Dockerfile.base.ubuntu.18.04

@@ -100,7 +100,7 @@ RUN wget https://pocoproject.org/releases/poco-${POCO_VERSION}/poco-${POCO_VERSI
 # build user-config.jam files
 RUN echo "using python : 3.6 : /usr ;" > ~/user-config.jam
 
-RUN wget https://dl.bintray.com/boostorg/release/${BOOST_VERSION_DOT}/source/boost_${BOOST_VERSION}.tar.bz2 \
+RUN wget https://boostorg.jfrog.io/artifactory/main/release/${BOOST_VERSION_DOT}/source/boost_${BOOST_VERSION}.tar.bz2 \
     && tar --bzip2 -xf boost_${BOOST_VERSION}.tar.bz2 && cd boost_${BOOST_VERSION}  \
     && ./bootstrap.sh --prefix=$ROOTDIR \
     && ./b2 -d0 -j $NUM_CPU cxxstd=14 install variant=release link=shared  \