Update the last remaining instance of the old FSF address

plugins-scripts/check_mssql.pl

@@ -19,7 +19,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301, USA.
 #
 # Report bugs to: help@monitoring-plugins.org
 #