Update @superfaceai/service-client to v5.2.1

[janhalama]

Description

This PR updates @superfaceai/service-client to v5.2.1 with fixed getProvidersList, getProvider and getUserInfo methods which did not set Accept header.

Motivation and Context

Upcoming versions of Superface services API will not accept request without Accept header set.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ ] I have updated the documentation accordingly. For updating Oclif commands documentation use oclif-dev.
• [x] I have read the CONTRIBUTION_GUIDE document.
• [x] I haven't repeated the code. (DRY)
• [ ] I have added tests to cover my changes.
• [x] All new and existing tests passed.