fix: resolve CI failures for clippy and macOS uptime test

- Fix clippy::borrow-as-ptr lint error in parse_size.rs by using raw pointer syntax
- Fix macOS uptime test regex to accept integer load averages without decimals

Fixes OpenBSD and macOS CI test failures in PR uutils#9653

Author: naoNao89

src/uucore/src/lib/features/parser/parse_size.rs

@@ -108,7 +108,7 @@ fn bsd_sysctl_memory(hw_constant: libc::c_int, sysctl_name: &str) -> Result<u128
             mib.as_mut_ptr(),
             2,
             ptr::from_mut(&mut size).cast::<libc::c_void>(),
-            &mut len,
+            &raw mut len,
             ptr::null_mut(),
             0,
         )

tests/by-util/test_uptime.rs

@@ -338,8 +338,8 @@ fn test_uptime_macos_output_format() {
         "Output should contain 'up': {stdout}"
     );
 
-    // Verify load average is present
-    let load_re = Regex::new(r"load average: \d+\.\d+, \d+\.\d+, \d+\.\d+").unwrap();
+    // Verify load average is present (decimal point is optional, e.g., "10" or "10.00")
+    let load_re = Regex::new(r"load average: \d+(?:\.\d+)?, \d+(?:\.\d+)?, \d+(?:\.\d+)?").unwrap();
     assert!(
         load_re.is_match(stdout),
         "Output should contain load average: {stdout}"