Use an alternative mirror for boost artifacts

The JFrog artifactory link is down, so changing to an alternative
mirror mentioned in boostorg/boost#842.

Change-Id: Id83c97d6506dd388ba76b5b01576860844080fa9

docker/install/ubuntu_install_boost.sh

@@ -27,7 +27,7 @@ trap cleanup 0
 # NOTE: by default, tvm-venv python is used. Install boost on the system.
 PATH=${PATH/${TVM_VENV}\/bin:/}
 
-curl -LO https://boostorg.jfrog.io/artifactory/main/release/1.67.0/source/boost_1_67_0.tar.gz
+curl -LO https://archives.boost.io/release/1.67.0/source/boost_1_67_0.tar.gz
 BOOST_HASH=8c247e040303a97895cee9c9407ef205e2c3ab09f0b8320997835ad6221dff23a87231629498ccfd0acca473f74e9ec27b8bd774707b062228df1e5f72d44c92
 echo "$BOOST_HASH" boost_1_67_0.tar.gz | sha512sum -c
 tar -xf boost_1_67_0.tar.gz