Update tox.ini

Author: xrmx

tox.ini

@@ -241,8 +241,8 @@ envlist =
     ; opentelemetry-instrumentation-grpc
     ; The numbers at the end of the environment names
     ; below mean these dependencies are being used:
-    ; 0: grpcio>=1.63.0
-    ; 1: grpcio<=1.62.0
+    ; 0: grpcio==1.62.0
+    ; 1: grpcio==1.63.0
     py3{8,9,10,11}-test-instrumentation-grpc-{0,1}
     pypy3-test-instrumentation-grpc-{0,1}
     lint-instrumentation-grpc