Bump MSRV to 1.63 for socket 0.5.3

Author: djc

.github/workflows/CI.yml

@@ -77,6 +77,6 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@master
         with:
-          toolchain: "1.60"
+          toolchain: "1.63"
 
       - run: cargo check --lib --all-features

Cargo.toml

@@ -9,7 +9,7 @@ readme = "README.md"
 description = "Asynchronous TLS/SSL streams for Tokio using Rustls."
 categories = ["asynchronous", "cryptography", "network-programming"]
 edition = "2018"
-rust-version = "1.60"
+rust-version = "1.63"
 
 [dependencies]
 tokio = "1.0"