Update Lucene Licence Info (#14028)

Author: QilongTang

LICENSE.txt

@@ -603,6 +603,6 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 Lucene.Net
-https://unlicense.org/
+https://lucenenet.apache.org/
 https://github.com/apache/lucenenet/blob/master/LICENSE.txt