Clippy failing on master #4100

   Compiling datafusion-proto v13.0.0 (/__w/arrow-datafusion/arrow-datafusion/datafusion/proto)
error: deref which would be done by auto-deref
  --> datafusion/proto/build.rs:51:17
   |
51 |         .expect(&*format!("Cannot read {:?}", &descriptor_path));
   |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try this: `&format!("Cannot read {:?}", &descriptor_path)`
   |
   = note: `-D clippy::explicit-auto-deref` implied by `-D warnings`
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref

error: deref which would be done by auto-deref
  --> datafusion/proto/build.rs:55:17
   |
55 |           .expect(&*format!(
   |  _________________^
56 | |             "Cannot register descriptors {:?}",
57 | |             &descriptor_set
58 | |         ))
   | |_________^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref
help: try this
   |
55 ~         .expect(&format!(
56 +             "Cannot register descriptors {:?}",
57 +             &descriptor_set
58 ~         ))
   |