chore: Fix spelling: that the

Signed-off-by: Josh Soref <[email protected]>

Author: jsoref

src/google/adk/agents/config_schemas/AgentConfig.json

@@ -4428,7 +4428,7 @@
     },
     "mcp__types__Tool": {
       "additionalProperties": true,
-      "description": "Definition for a tool the client can call.",
+      "description": "Definition for a tool that the client can call.",
       "properties": {
         "name": {
           "title": "Name",