try to uninstall python3.8 and not install boost for 3.10 on Ubuntu20.04

Author: berndgassmann

.github/workflows/install_dependencies.sh

@@ -37,6 +37,11 @@ if (( COMPILE_BOOST )); then
   py3_root=`${py3} -c "import sys; print(sys.prefix)"`
   pyv=`$py3 -c "import sys;x='{v[0]}.{v[1]}'.format(v=list(sys.version_info[:2]));sys.stdout.write(x)";`
 
+  echo "  ./bootstrap.sh \
+    --prefix=${ROOT_DIR}/install/boost
+    --with-libraries=python,filesystem,system,program_options \
+                  --with-python=${py3} --with-python-root=${py3_root}"
+
   ./bootstrap.sh \
     --prefix=${ROOT_DIR}/install/boost
     --with-libraries=python,filesystem,system,program_options \