Bump structopt from 0.3.21 to 0.3.23

Bumps [structopt](https://github.com/TeXitoi/structopt) from 0.3.21 to 0.3.23.
- [Release notes](https://github.com/TeXitoi/structopt/releases)
- [Changelog](https://github.com/TeXitoi/structopt/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TeXitoi/structopt/compare/v0.3.21...v0.3.23)

---
updated-dependencies:
- dependency-name: structopt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.lock

@@ -3420,9 +3420,9 @@ checksum = "6446ced80d6c486436db5c078dde11a9f73d42b57fb273121e160b84f63d894c"
 
 [[package]]
 name = "structopt"
-version = "0.3.21"
+version = "0.3.23"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5277acd7ee46e63e5168a80734c9f6ee81b1367a7d8772a2d765df2a3705d28c"
+checksum = "bf9d950ef167e25e0bdb073cf1d68e9ad2795ac826f2f3f59647817cf23c0bfa"
 dependencies = [
  "clap",
  "lazy_static",
@@ -3431,9 +3431,9 @@ dependencies = [
 
 [[package]]
 name = "structopt-derive"
-version = "0.4.14"
+version = "0.4.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5ba9cdfda491b814720b6b06e0cac513d922fc407582032e8706e9f137976f90"
+checksum = "134d838a2c9943ac3125cf6df165eda53493451b719f3255b2a26b85f772d0ba"
 dependencies = [
  "heck",
  "proc-macro-error",

zebra-utils/Cargo.toml

@@ -8,7 +8,7 @@ edition = "2018"
 publish = false
 
 [dependencies]
-structopt = "0.3.21"
+structopt = "0.3.23"
 color-eyre = "0.5.11"
 hex = "0.4"
 serde_json = "1.0"