Bump vue-router version to 3.1.6 (#6500)
Bump vue-router version to 3.1.6 (#6500)

3.1.6 includes a type change causing a compilation issue Type 'string | null | undefined' is not assignable to type 'string | undefined' when used with 3.1.5 from quasar
rstoenescu/quasar-framework,rstoenescu/quasar-framework,fsgiudice/quasar,quasarframework/quasar,quasarframework/quasar,fsgiudice/quasar,quasarframework/quasar,quasarframework/quasar,pdanpdan/quasar,fsgiudice/quasar,rstoenescu/quasar-framework,pdanpdan/quasar,pdanpdan/quasar,pdanpdan/quasar