Update license date and version number

Author: yGuy

LICENSE

@@ -1,6 +1,6 @@
-These demo files are part of yFiles for HTML 2.2.
+These demo files are part of yFiles for HTML 2.4.
 https://www.yworks.com/yfileshtml
-Copyright (c) 2000-2019 by yWorks GmbH, Vor dem Kreuzberg 28,
+Copyright (c) 2000-2022 by yWorks GmbH, Vor dem Kreuzberg 28,
 72070 Tuebingen, Germany. All rights reserved.
 
 yFiles demo files exhibit yFiles for HTML functionalities. Any redistribution
@@ -23,4 +23,4 @@ TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.