Crash in http in WASM due to hitting std::time::Instant::now()

**Describe the bug**
Calling `std::time::Instant::now()` crashes unconditionally on WASM. retry.rs uses tokio::time::sleep() in the retry case, so you may think things are working but see intermittent crashes.

**To Reproduce**
Any http request that is retried in WASM should display the problem.

**Expected behavior**
No crash.

**Additional context**
See for example https://github.com/apache/arrow-rs-object-store/blob/main/src/client/retry.rs#L389

Start by reading src/client/retry.rs around line 389, where the issue identifies the problematic time call in the retry path. Reproduce an HTTP request retry under WASM and trace the timing behavior. Done means retried WASM requests no longer crash.

Written by the indexing model from the issue text.