SM-1058: Update the changelog (#460)

## Type of change

<!-- (mark with an `X`) -->

```
- [ ] Bug fix
- [ ] New feature development
- [ ] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [x] Other
```

## Objective

<!--Describe what the purpose of this PR is. For example: what bug
you're fixing or what new feature you're adding-->

Changelog update for the release on 2023-12-21.

## Before you submit

- Please add **unit tests** where it makes sense to do so (encouraged
but not required)

crates/bitwarden/CHANGELOG.md

@@ -7,6 +7,8 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [0.4.0] - 2023-12-21
+
 ### Added
 
 - Support for basic state to avoid reauthenticating when creating a new `Client`. This is a breaking

crates/bws/CHANGELOG.md

@@ -7,6 +7,8 @@ adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [0.4.0] - 2023-12-21
+
 ### Added
 
 - Ability to output secrets in an `env` format with `bws` (#320)