Bump MSRV to 1.65.0

`yubikey 0.8.0` will have this MSRV, and it includes changes we need.

CHANGELOG.md

@@ -8,7 +8,7 @@ to 0.3.0 are beta releases.
 
 ## [Unreleased]
 ### Changed
-- MSRV is now 1.60.0.
+- MSRV is now 1.65.0.
 - The YubiKey PIV PIN and touch caches are now preserved across processes in
   most cases. See [README.md](README.md#agent-support) for exceptions. This has
   several usability effects (not applicable to YubiKey 4 series):

Cargo.toml

@@ -9,7 +9,7 @@ keywords = ["age", "cli", "encryption", "yubikey"]
 categories = ["command-line-utilities", "cryptography"]
 license = "MIT OR Apache-2.0"
 edition = "2021"
-rust-version = "1.60" # MSRV
+rust-version = "1.65" # MSRV
 
 [package.metadata.deb]
 extended-description = """\

README.md

@@ -9,7 +9,7 @@ which enables files to be encrypted to age identities stored on YubiKeys.
 On Windows, Linux, and macOS, you can use the
 [pre-built binaries](https://github.com/str4d/age-plugin-yubikey/releases).
 
-If your system has Rust 1.60+ installed (either via `rustup` or a system
+If your system has Rust 1.65+ installed (either via `rustup` or a system
 package), you can build directly from source:
 
 ```

rust-toolchain.toml

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "1.60.0"
+channel = "1.65.0"
 components = ["clippy", "rustfmt"]