Auto merge of rust-lang#7394 - ehuss:update-opener, r=ehuss

Update opener.

This updates the opener dependency, to try to reduce the duplicate dependencies in the rust-lang/rust repo.  The changelog is [here](https://github.com/Seeker14491/opener/blob/master/CHANGELOG.md#050---2021-06-11), and I don't expect it to have much of a change to anyone.

changelog: none

Author: bors

clippy_dev/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 bytecount = "0.6"
 clap = "2.33"
 itertools = "0.9"
-opener = "0.4"
+opener = "0.5"
 regex = "1"
 shell-escape = "0.1"
 walkdir = "2"