msrv: bump to Rust 1.73

This isn't strictly necessary, but I'm doing a minor version bump and
might as well move the trains along.

Author: BurntSushi

.github/workflows/ci.yml

@@ -36,7 +36,7 @@ jobs:
         include:
         - build: pinned
           os: ubuntu-latest
-          rust: 1.65.0
+          rust: 1.73.0
         - build: stable
           os: ubuntu-latest
           rust: stable

Cargo.toml

@@ -12,7 +12,7 @@ license = "MIT OR Apache-2.0"
 categories = ["text-processing", "encoding"]
 exclude = ["/.github", "/scripts"]
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 resolver = "2"
 
 [workspace]

README.md

@@ -146,7 +146,7 @@ Unicode support.
 
 ### Minimum Rust version policy
 
-This crate's minimum supported `rustc` version (MSRV) is `1.65`.
+This crate's minimum supported `rustc` version (MSRV) is `1.73`.
 
 In general, this crate will be conservative with respect to the minimum
 supported version of Rust. MSRV may be bumped in minor version releases.