Bump MSRV to 1.81 (#582)

This is required due to the `hybrid-array` crate, which has become a
transitive dependency of the majority of our dependencies and will be
required in the very near future.

cli/CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## Unreleased
+### Changed
+- MSRV is now 1.81.
+
 ## 0.7.0 (2022-11-14)
 ### Changed
 - Bump `clap` to v4.0 ([#438])

cli/Cargo.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 categories = ["command-line-utilities", "cryptography", "hardware-support"]
 keywords = ["ecdsa", "rsa", "piv", "pcsc", "yubikey"]
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.81"
 
 [dependencies]
 clap = { version = "4", features = ["derive"] }

cli/src/terminal.rs

@@ -196,7 +196,7 @@ pub fn print_cert_info(
     print_cert_attr(
         stream,
         "Fingerprint",
-        &hex::upper::encode_string(&fingerprint),
+        hex::upper::encode_string(&fingerprint),
     )?;
     print_cert_attr(
         stream,