Bump MSRV to 1.63 for socket 0.5.3

.github/workflows/rust.yml

@@ -40,7 +40,7 @@ jobs:
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
-          toolchain: 1.60.0
+          toolchain: 1.63.0
           override: true
       - uses: actions-rs/cargo@v1
         with:

Cargo.toml

@@ -2,6 +2,7 @@
 name = "instant-acme"
 version = "0.4.0"
 edition = "2021"
+rust-version = "1.63"
 license = "Apache-2.0"
 description = "Async pure-Rust ACME client"
 homepage = "https://github.com/instant-labs/instant-acme"
@@ -9,7 +10,6 @@ repository = "https://github.com/instant-labs/instant-acme"
 documentation = "https://docs.rs/instant-acme"
 keywords = ["letsencrypt", "acme"]
 categories = ["web-programming", "api-bindings"]
-rust-version = "1.60.0"
 
 [features]
 default = ["hyper-rustls"]