opentelemetry-sdk 1.28.1

Version 1.28.1/0.49b1

on Python PyPI

This is a patch release on the previous 1.28.0/0.49b0 release, fixing the issue(s) below.

• Fix metrics export with exemplar and no context and filtering observable instruments (#4251)
• Fix recursion error with sdk disabled and handler added to root logger (#4259)