Bump System.Linq.Dynamic.Core from 1.3.14 to 1.4.2 in /samples/snippets/visualbasic/programming-guide/dynamic-linq-expression-trees

Bump System.Linq.Dynamic.Core from 1.3.14 to 1.4.2 in /samples/snippets/visualbasic/programming-guide/dynamic-linq-expression-trees #1429