project: MSRV 1.56 -> 1.64

Unfortunately Rust 1.64.0 is the oldest toolchain version that we can
get working with cargo-ndk, which is required for building *ring* for
the Android targets.

The prior MSRV was not being tested correctly in CI and so wasn't
actually compatible with the crate as it stands today.

Author: cpu

.github/workflows/ci.yml

@@ -70,7 +70,7 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.56.0" # MSRV
+          toolchain: "1.64.0" # MSRV
           components: clippy
 
       - name: Install cargo-ndk.

Cargo.toml

@@ -7,7 +7,7 @@ keywords = ["tls", "certificate", "verification", "os", "native"]
 repository = "https://github.com/1Password/rustls-platform-verifier"
 license = "MIT OR Apache-2.0"
 edition = "2021"
-rust-version = "1.56"
+rust-version = "1.64.0"
 
 exclude = [
     "android/.run",

README.md

@@ -2,7 +2,7 @@
 
 [![crates.io version](https://img.shields.io/crates/v/rustls-platform-verifier.svg)](https://crates.io/crates/rustls-platform-verifier)
 [![crate documentation](https://docs.rs/rustls-platform-verifier/badge.svg)](https://docs.rs/rustls-platform-verifier)
-![MSRV](https://img.shields.io/badge/rustc-1.56+-blue.svg)
+![MSRV](https://img.shields.io/badge/rustc-1.64+-blue.svg)
 [![crates.io downloads](https://img.shields.io/crates/d/rustls-platform-verifier.svg)](https://crates.io/crates/rustls-platform-verifier)
 ![CI](https://github.com/1Password/rustls-platform-verifier/workflows/CI/badge.svg)
 
@@ -159,4 +159,4 @@ Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
 Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
 be dual licensed as above, without any additional terms or conditions.
-</sub>
+</sub>