BaseTools: Update WindowsVsToolChain plugin

This patch updates edk2-pytool-library dependency to v0.14.0, which has
an interface change to FindWithVsWhere. The BaseTools plugin uses this
function, so it is being updated to account for the interface change.

Cc: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Yuwei Chen <yuwei.chen@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>

Signed-off-by: Joey Vagedes <joeyvagedes@microsoft.com>
Acked-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>