Bump file-type and @line/bot-sdk in /examples/echo-bot-ts

Bumps [file-type](https://github.com/sindresorhus/file-type) to 16.5.4 and updates ancestor dependency [@line/bot-sdk](https://github.com/line/line-bot-sdk-nodejs). These dependencies need to be updated together.


Updates `file-type` from 15.0.1 to 16.5.4
- [Release notes](https://github.com/sindresorhus/file-type/releases)
- [Commits](sindresorhus/file-type@v15.0.1...v16.5.4)

Updates `@line/bot-sdk` from 7.3.0 to 7.5.2
- [Release notes](https://github.com/line/line-bot-sdk-nodejs/releases)
- [Changelog](https://github.com/line/line-bot-sdk-nodejs/blob/next/CHANGELOG.md)
- [Commits](v7.3.0...v7.5.2)

---
updated-dependencies:
- dependency-name: file-type
  dependency-type: indirect
- dependency-name: "@line/bot-sdk"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]