Update opentelemetry-sdk min compatible version (#2442)

Author: owais

CHANGELOG.md

@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased](https://github.com/open-telemetry/opentelemetry-python/compare/v1.9.1-0.28b1...HEAD)
 
+- `opentelemetry-exporter-otlp-grpc` update SDK dependency to ~1.9.
+  ([#2442](https://github.com/open-telemetry/opentelemetry-python/pull/2442))
+
 ## [1.9.1-0.28b1](https://github.com/open-telemetry/opentelemetry-python/releases/tag/v1.9.1-0.28b1) - 2022-01-29
 
 - Update opentelemetry-proto to v0.12.0. Note that this update removes deprecated status codes.

exporter/opentelemetry-exporter-otlp-proto-grpc/setup.cfg

@@ -43,7 +43,7 @@ install_requires =
     grpcio >= 1.0.0, < 2.0.0
     googleapis-common-protos ~= 1.52
     opentelemetry-api ~= 1.3
-    opentelemetry-sdk ~= 1.3
+    opentelemetry-sdk ~= 1.9
     opentelemetry-proto == 1.9.1
     backoff ~= 1.10.0