update the copyright date to 2023 (#12905) (#12911)

ti-chi-bot · web-flow · commit e5d1374715e0 · 2023-03-16T10:40:40.000+08:00
diff --git a/templates/copyright.tex b/templates/copyright.tex
@@ -1,4 +1,4 @@
 
 \noindent \rule{\textwidth}{1pt}
 
-©2019 PingCAP All Rights Reversed.
+©2023 PingCAP All Rights Reversed.
