v1.9.1

🐛 (Bug Fix)

• fix: avoid grpc types dependency #3551 @Flarna
• fix(otlp-proto-exporter-base): Match Accept header with Content-Type in the proto exporter
  #3562 @scheler
• fix: include tracestate in export #3569 @Flarna

🏠 (Internal)

• chore: fix cross project links and missing implicitly exported types #3533 @legendecas
• feat(sdk-metrics): add exponential histogram mapping functions #3504 @mwear