Restore MRSV to 1.63

Author: a1phyr

Cargo.toml

@@ -10,7 +10,7 @@ keywords = ["hash", "no_std", "hashmap", "swisstable"]
 categories = ["data-structures", "no-std"]
 exclude = [".github", "/ci/*"]
 edition = "2021"
-rust-version = "1.65.0"
+rust-version = "1.63.0"
 
 [dependencies]
 # For the default hasher

src/raw/mod.rs

@@ -1433,7 +1433,7 @@ impl RawTableInner {
         Self {
             // Be careful to cast the entire slice to a raw pointer.
             ctrl: unsafe {
-                NonNull::new_unchecked(Group::static_empty().as_ptr().cast_mut().cast())
+                NonNull::new_unchecked(Group::static_empty().as_ptr() as *mut _)
             },
             bucket_mask: 0,
             items: 0,