Avoid pulling in older version of stencil

This commit avoids a `lein-pedantic` complaint:

    Failing dependency resolution because:

    [lein-resource "0.3.2"] -> [stencil "0.3.1"]
      is overrulling
    [com.palletops/lein-pallet-crate "0.1.0"] -> [stencil "0.3.2"]

    Please use [lein-resource "0.3.2" :exclusions [stencil]] to get [stencil "0.3.2"] or use [com.palletops/lein-pallet-crate "0.1.0" :exclusions [stencil]] to get [stencil "0.3.1"].