chore(deps): bump body-parser to latest across mastra lockfiles (#497)

## Pull Request Checklist

Please ensure that your PR meets the following requirements:

- [x] I have read the [CONTRIBUTING](CONTRIBUTING.md) guide.
- [ ] I have updated the documentation (if applicable). -- N/A
- [x] My code follows the style guidelines of this project.
- [x] I have performed a self-review of my own code.
- [ ] I have added tests that prove my fix is effective or that my
feature works. -- N/A as this is a dependency bump
- [x] New and existing unit tests pass locally with my changes.

## Description

`body-parser` was outdated as a transitive dependency (pulled in via
`@mastra/core` → `@a2a-js/sdk`/`@modelcontextprotocol/sdk`) in two npm
lockfiles: `packages/mastra-moss/package-lock.json` and
`examples/cookbook/mastra/package-lock.json`. Ran `npm update
body-parser` in both to advance it to the newest versions allowed by the
existing dependency ranges:

- `2.2.2` → `2.3.0` (top-level, required by `@a2a-js/sdk` and the nested
`express@5` from `@modelcontextprotocol/sdk`)
- `1.20.5` → `1.20.6` (nested under `express@4.22.2`, still within
express's own pinned `~1.20.5` range)

No `package.json` changes were needed since `body-parsern either
project. Verified typecheck and test suite passfor
`packages/mastra-moss`, and confirmed no new `npm audit` vulnerabilities
were introduced.

Fixes #472

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functi
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

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Author: rohanshrma222