Bump MSRV to 1.70

Author: Thomasdezeeuw

Cargo.toml

@@ -18,7 +18,7 @@ possible intended.
 keywords      = ["io", "socket", "network"]
 categories    = ["api-bindings", "network-programming"]
 edition       = "2021"
-rust-version  = "1.63"
+rust-version  = "1.70"
 include       = [
   "Cargo.toml",
   "LICENSE-APACHE",

README.md

@@ -66,7 +66,7 @@ feature flag.
 
 # Minimum Supported Rust Version (MSRV)
 
-Socket2 uses 1.63.0 as MSRV.
+Socket2 uses 1.70.0 as MSRV.
 
 # License
 

src/sys/unix.rs

@@ -2828,11 +2828,6 @@ impl crate::Socket {
 #[cfg(all(feature = "all", any(target_os = "linux", target_os = "android")))]
 #[repr(transparent)]
 pub struct SockFilter {
-    // For some reason Rust 1.63 thinks this field is unused, while it's clearly
-    // used in `SockFilter::new`. This issue seems fixed in later Rust versions,
-    // but we still need to support 1.63, adding allow(dead_code) ignores the
-    // issue.
-    #[allow(dead_code)]
     filter: libc::sock_filter,
 }