Revert "perf(arm): use umaxv instead of uminv"

This reverts commit d8c03fe.

src/arch/aarch64.rs

@@ -74,7 +74,7 @@ pub(crate) unsafe fn check_neon(input: &[u8]) -> bool {
 
         let valid_letter = vorrq_u8(valid_lower, valid_upper);
         let valid_mask = vorrq_u8(valid_digit, valid_letter);
-        vmaxvq_u8(valid_mask) == 0
+        vminvq_u8(valid_mask) == 0xFF
     })
 }