Remove pin packages in Dockerfile

[valar999]

This practice is incorrect. Is it necessary to pin packages that important for build process. Alpine as any other distribution update packages and Dockerfile with pinned app will fail.

Checklist:

• [x] Code follows the style guidelines
• [x] Documentation updated
• [x] Corner cases evaluated and handled
• [x] Automatic tests added/update
• [x] Automatic tests pass
• [x] Software runs (locally or hosted)
• [x] Sanity check passed
• [x] Self-review passed