Replaced deprecated bintray addresses. (#788)

diff --git a/dependencies/boost/CMakeLists.txt b/dependencies/boost/CMakeLists.txt
index c6ea853..edde139 100644
--- a/dependencies/boost/CMakeLists.txt
+++ b/dependencies/boost/CMakeLists.txt
@@ -76,7 +76,7 @@
 set(EXTERN ${PROJECT_NAME}-extern)
 include(ExternalProject)
 ExternalProject_Add(${EXTERN}
-   URL "https://dl.bintray.com/boostorg/release/${PROJECT_VERSION}/source/boost_${_VERSION_UNDERSCORE}.tar.gz"
+   URL "https://boostorg.jfrog.io/artifactory/main/release/${PROJECT_VERSION}/source/boost_${_VERSION_UNDERSCORE}.tar.gz"
        "https://sourceforge.net/projects/boost/files/boost/${PROJECT_VERSION}/boost_${_VERSION_UNDERSCORE}.tar.gz/download"
    URL_HASH SHA256=${SHA256}
    UPDATE_COMMAND ""