updates opentelemetry-api version to avoid pkg_resources dependency

Author: chalmerlowe

packages/google-cloud-bigquery/testing/constraints-3.8.txt

@@ -17,7 +17,7 @@ grpcio==1.49.1; python_version >= '3.11'
 ipywidgets==7.7.1
 ipython==7.23.1
 ipykernel==6.2.0
-opentelemetry-api==1.1.0
+opentelemetry-api==1.16.0
 opentelemetry-instrumentation==0.20b0
 opentelemetry-sdk==1.1.0
 numpy==1.20.2

packages/google-cloud-bigquery/testing/constraints-3.9.txt

@@ -17,7 +17,7 @@ grpcio==1.49.1; python_version >= '3.11'
 ipywidgets==7.7.1
 ipython==7.23.1
 ipykernel==6.2.0
-opentelemetry-api==1.1.0
+opentelemetry-api==1.16.0
 opentelemetry-instrumentation==0.20b0
 opentelemetry-sdk==1.1.0
 numpy==1.20.2