fix grpc tests

Signed-off-by: emdneto <9735060+emdneto@users.noreply.github.com>

Author: emdneto

instrumentation/opentelemetry-instrumentation-grpc/test-requirements-1.txt

@@ -1,6 +1,6 @@
 asgiref==3.8.1
 Deprecated==1.2.14
-grpcio==1.66.2
+grpcio==1.75.1
 iniconfig==2.0.0
 packaging==24.0
 pluggy==1.5.0

tox.ini

@@ -302,7 +302,8 @@ envlist =
     ; The numbers at the end of the environment names
     ; below mean these dependencies are being used:
     ; 0: grpcio==1.62.0
-    ; 1: grpcio==1.66.2
+    ; 1: grpcio==1.75.1
+    ; TODO: simplify tests-requirements here to use latest|oldest testing pattern
     py3{9,10,11,12}-test-instrumentation-grpc-{0,1}
     py3{13,14}-test-instrumentation-grpc-1
     lint-instrumentation-grpc