MSRV: bump to 1.66

One of our indirect dependencies (`toml_edit`) has updated its MSRV. As
we do not keep Cargo.lock committed in the repo and cargo does not honor
MSRV during crate resolution, we can just bump our current MSRV by one
version forward, from 1.65.0 to 1.66.0.

The version 1.66.0 is over 8 months old, so it's pretty old by the
MSRV-breaking standards of the community.

.github/workflows/rust.yml

@@ -10,7 +10,7 @@ env:
   CARGO_TERM_COLOR: always
   RUSTFLAGS: -Dwarnings
   RUST_BACKTRACE: full
-  rust_min: 1.65.0 # <- Update this when bumping up MSRV
+  rust_min: 1.66.0 # <- Update this when bumping up MSRV
 
 jobs:
   build:

README.md

@@ -3,7 +3,7 @@
 # ScyllaDB Rust Driver
 
 [![Crates.io](https://img.shields.io/crates/v/scylla.svg)](https://crates.io/crates/scylla) [![docs.rs](https://docs.rs/scylla/badge.svg)](https://docs.rs/scylla)
-[![minimum rustc version](https://img.shields.io/badge/rustc-1.65-orange.svg)](https://crates.io/crates/scylla)
+[![minimum rustc version](https://img.shields.io/badge/rustc-1.66-orange.svg)](https://crates.io/crates/scylla)
 
 This is a client-side driver for [ScyllaDB] written in pure Rust with a fully async API using [Tokio].
 Although optimized for ScyllaDB, the driver is also compatible with [Apache Cassandra®].
@@ -65,7 +65,7 @@ Ongoing efforts:
 Please join the `#rust-driver` channel on [ScyllaDB Slack] to discuss any issues or questions you might have.
 
 ## Supported Rust Versions
-Our driver's minimum supported Rust version (MSRV) is 1.65.0. Any changes will be explicitly published and will only happen during major releases.
+Our driver's minimum supported Rust version (MSRV) is 1.66.0. Any changes will be explicitly published and will only happen during major releases.
 
 ## Reference Documentation