Update structopt dependency to 0.3.21

This change updates the structopt crate to version 0.3.21. We need this version as it fixes a compilation error [0] when using the external_subcommand enum variant annotation provided by the crate with certain versions of Rust. [0]: TeXitoi/structopt#447
d-e-s-o · Dec 1, 2020 · 598d07f · 598d07f
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -9,6 +9,7 @@ Unreleased
 - Renamed the `--{no-,}{numlock,capslock,scrollock}` options of the `config
   set` command to `--{no-,}{num-lock,caps-lock,scroll-lock}`
 - Bumped `nitrokey` dependency to `0.8.0`
+- Bumped `structopt` dependency to `0.3.21`
 
 
 0.3.5

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/Cargo.toml b/Cargo.toml
@@ -61,7 +61,7 @@ version = "1.0"
 features = ["derive"]
 
 [dependencies.structopt]
-version = "0.3.17"
+version = "0.3.21"
 default-features = false
 
 [dependencies.termion]