MSVC build: changed Boost URL

.github/workflows/sdrangel.yml

@@ -58,7 +58,7 @@ jobs:
         env:
           BOOST_ROOT: ${{ matrix.config.boost_dl }}
           BOOST_DEST: ${{ matrix.config.lib_dir }}
-          BOOST_URL: https://sourceforge.net/projects/boost/files/boost/1.73.0/boost_1_73_0.tar.bz2/download
+          BOOST_URL: https://boostorg.jfrog.io/artifactory/main/release/1.73.0/source/boost_1_73_0.tar.bz2
         run: |
           mkdir -p $BOOST_ROOT
           mkdir -p $BOOST_DEST