Bump aws/aws-sdk-php from 3.281.13 to 3.294.5 in /expose/api

Bumps [aws/aws-sdk-php](https://github.com/aws/aws-sdk-php) from 3.281.13 to 3.294.5.
- [Release notes](https://github.com/aws/aws-sdk-php/releases)
- [Commits](aws/aws-sdk-php@3.281.13...3.294.5)

---
updated-dependencies:
- dependency-name: aws/aws-sdk-php
  dependency-type: indirect
...

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