soundness(neon): Require `T: 'static` on `JsArrayBuffer::external` and `JsBuffer::external`
soundness(neon): Require `T: 'static` on `JsArrayBuffer::external` and `JsBuffer::external`

Fixes https://github.com/neon-bindings/neon/issues/896

neon-bindings/neon,neon-bindings/neon,neon-bindings/neon,neon-bindings/neon