Try to reduce rounding of floats

.github/actions/benchmarker/src/bench.rs

@@ -120,7 +120,7 @@ fn bench_single_cmd_getrusage(cmd: Vec<String>) -> SingleBench {
         counters: BTreeMap::from_iter([(
             "user-time".to_owned(),
             BenchCounter {
-                value: user_time.as_secs_f64() * 1000.0,
+                value: user_time.as_millis() as f64,
                 unit: "msec".to_owned(),
             },
         )]),