Bump MSRV to 1.65

``` error: package `nix v0.27.1` cannot be built because it requires rustc 1.65 or newer, while the currently active rustc version is 1.64.0 ```
taiki-e · Sep 4, 2023 · 5baa426 · 5baa426
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diff --git a/Cargo.toml b/Cargo.toml
@@ -2,7 +2,7 @@
 name = "cargo-hack"
 version = "0.6.4"
 edition = "2021"
-rust-version = "1.64"
+rust-version = "1.65"
 license = "Apache-2.0 OR MIT"
 repository = "https://github.com/taiki-e/cargo-hack"
 keywords = ["cargo", "subcommand", "testing"]

diff --git a/README.md b/README.md
@@ -412,7 +412,7 @@ fields of [`cargo metadata`][cargo-metadata].*
 cargo +stable install cargo-hack --locked
 ```
 
-*Compiler support: requires rustc 1.64+*
+*Compiler support: requires rustc 1.65+*
 
 cargo-hack is usually runnable with Cargo versions older than the Rust version
 required for installation (e.g., `cargo +1.31 hack check`). Currently, to run