mgr/cephadm: add a type annotation to the ganesha conf template context

This change makes this file pass mypy checking on mypy 0.981.

Signed-off-by: John Mulligan <jmulligan@redhat.com>

src/pybind/mgr/cephadm/services/nfs.py

@@ -95,7 +95,7 @@ class NFSService(CephService):
 
         # generate the ganesha config
         def get_ganesha_conf() -> str:
-            context = {
+            context: Dict[str, Any] = {
                 "user": rados_user,
                 "nodeid": nodeid,
                 "pool": POOL_NAME,