add mobly to dev deps
diff --git a/setup.cfg b/setup.cfg
index 305357a..9fc5c59 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -90,6 +90,7 @@
     black == 24.3
     grpcio-tools >= 1.62.1
     invoke >= 1.7.3
+    mobly >= 1.12.2
     mypy == 1.10.0
     nox >= 2022
     pylint == 3.1.0