Update rust-version to 1.68.2

The previous version was too low and triggered errors in the CI/CI since some of the dependencies have set their MSRV to `1.68`.

Author: daniel-abramov

CHANGELOG.md

@@ -1,3 +1,7 @@
+# UNRELEASED
+
+* Update MSRV to `1.68.2`.
+
 # 0.28.0
 * Reduce `Error` size 136 -> **32** by boxing internals of `Error::Http`, `Error::WriteBufferFull`,
   `ProtocolError::InvalidHeader`, `TlsError::Native`, `TlsError::Rustls`.

Cargo.toml

@@ -11,7 +11,7 @@ documentation = "https://docs.rs/tungstenite/0.28.0"
 repository = "https://github.com/snapview/tungstenite-rs"
 version = "0.28.0"
 edition = "2021"
-rust-version = "1.63"
+rust-version = "1.68.2"
 include = ["benches/**/*", "src/**/*", "examples/**/*", "LICENSE-*", "README.md", "CHANGELOG.md"]
 
 [package.metadata.docs.rs]