Prepare rand 0.9.2 (#1648)

# Summary

Requested by @aleb in #1646.

## [0.9.2 — 2025-07-20]
### Deprecated
- Deprecate `rand::rngs::mock` module and `StepRng` generator (#1634)

### Additions
- Enable `WeightedIndex<usize>` (de)serialization (#1646)

Author: dhardy

CHANGELOG.md

@@ -8,7 +8,7 @@ A [separate changelog is kept for rand_core](rand_core/CHANGELOG.md).
 
 You may also find the [Upgrade Guide](https://rust-random.github.io/book/update.html) useful.
 
-## [Unreleased]
+## [0.9.2 — 2025-07-20]
 ### Deprecated
 - Deprecate `rand::rngs::mock` module and `StepRng` generator (#1634)
 

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "rand"
-version = "0.9.1"
+version = "0.9.2"
 authors = ["The Rand Project Developers", "The Rust Project Developers"]
 license = "MIT OR Apache-2.0"
 readme = "README.md"