chore(setup): add version for b3 propagator in setup.cfg

Author: Div95

propagator/opentelemetry-propagator-env/setup.cfg

@@ -43,7 +43,7 @@ install_requires =
     opentelemetry-api ~= 1.3
 
 [options.extras_require]
-test = opentelemetry-propagator-b3
+test = opentelemetry-propagator-b3 ~= 1.3
 
 [options.packages.find]
 where = src