update: adjoint plugin deprecation warning

Author: yaugenst-flex

tidy3d/plugins/adjoint/__init__.py

@@ -12,7 +12,7 @@
 
 _MSG = dedent(
     f"""
-    The 'adjoint' plugin (legacy JAX-based adjoint plugin) was deprecated in Tidy3D '2.7.0' and will be disabled as of '2.9.0'.
+    The 'adjoint' plugin (legacy JAX-based adjoint plugin) was deprecated in Tidy3D '2.7.0' and will be removed in '2.10.0'.
 
     Migrate to the native autograd workflow:
         import tidy3d as td