Rollup merge of rust-lang#129588 - hermit-os:sleep-micros, r=workingjubilee

pal/hermit: correctly round up microseconds in `Thread::sleep`

This fixes the Hermit-related part of rust-lang#129212 and thus the whole issue, since ESP-IDF is already fixed, as far as I understand.

Fixes rust-lang#129212

r? `@workingjubilee`

CC: `@stlankes`

Author: matthiaskrgr

Diff for: std/src/sys/pal/hermit/thread.rs

@@ -77,8 +77,11 @@ impl Thread {
 
     #[inline]
     pub fn sleep(dur: Duration) {
+        let micros = dur.as_micros() + if dur.subsec_nanos() % 1_000 > 0 { 1 } else { 0 };
+        let micros = u64::try_from(micros).unwrap_or(u64::MAX);
+
         unsafe {
-            hermit_abi::usleep(dur.as_micros() as u64);
+            hermit_abi::usleep(micros);
         }
     }