Java 13: add db stats for @yieldstmt

Author: yh-semmle

java/ql/src/config/semmlecode.dbscheme.stats

@@ -189,6 +189,10 @@
 <v>28672</v>
 </e>
 <e>
+<k>@yieldstmt</k>
+<v>100</v>
+</e>
+<e>
 <k>@arrayaccess</k>
 <v>53561</v>
 </e>