Pgsql cube type compile fail (#3459)

* fails to compile as size_of is not found in scope

* keep scoping consistent with other type modules

* fmt fixes

---------

Co-authored-by: kdesjard <kristian.desjardins@nrcan-rncan.gc.ca>

sqlx-postgres/src/types/cube.rs

@@ -5,6 +5,7 @@ use crate::types::Type;
 use crate::{PgArgumentBuffer, PgHasArrayType, PgTypeInfo, PgValueFormat, PgValueRef, Postgres};
 use sqlx_core::bytes::Buf;
 use sqlx_core::Error;
+use std::mem;
 use std::str::FromStr;
 
 const BYTE_WIDTH: usize = 8;
@@ -304,7 +305,7 @@ fn remove_parentheses(s: &str) -> String {
 }
 
 impl Header {
-    const PACKED_WIDTH: usize = size_of::<u32>();
+    const PACKED_WIDTH: usize = mem::size_of::<u32>();
 
     fn encoded_size(&self) -> usize {
         Self::PACKED_WIDTH + self.data_size()

sqlx-postgres/src/types/hstore.rs

@@ -1,6 +1,6 @@
 use std::{
     collections::{btree_map, BTreeMap},
-    mem::size_of,
+    mem,
     ops::{Deref, DerefMut},
     str,
 };
@@ -214,10 +214,10 @@ impl Encode<'_, Postgres> for PgHstore {
 }
 
 fn read_length(buf: &mut &[u8]) -> Result<i32, String> {
-    if buf.len() < size_of::<i32>() {
+    if buf.len() < mem::size_of::<i32>() {
         return Err(format!(
             "expected {} bytes, got {}",
-            size_of::<i32>(),
+            mem::size_of::<i32>(),
             buf.len()
         ));
     }