Update exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

Co-authored-by: Diego Hurtado <ocelotl@users.noreply.github.com>

Author: pridhi-arora

exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

@@ -257,7 +257,7 @@ def __init__(
         if self._headers is None:
             self._headers = tuple(_OTLP_GRPC_HEADERS)
         else:
-            self._headers = self._headers +  tuple(_OTLP_GRPC_HEADERS)
+            self._headers = self._headers + tuple(_OTLP_GRPC_HEADERS)
 
         self._timeout = timeout or int(
             environ.get(OTEL_EXPORTER_OTLP_TIMEOUT, 10)