fix: address Gemini code review feedback

- Use specific ZoneInfoNotFoundError exception instead of generic Exception
- Define REQUIREMENTS variable once and reuse to avoid duplication
- Keep generic Exception as fallback for unexpected errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jeremylongshore

notebooks/community/agent_engine/adk_inline_source_deployment.ipynb

@@ -102,9 +102,13 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install --upgrade --quiet \\\n",
-    "    \"google-cloud-aiplatform[adk,agent_engines]>=1.88.0\" \\\n",
-    "    \"google-adk>=1.18.0\""
+    "# Define requirements once for reuse\n",
+    "REQUIREMENTS = [\n",
+    "    \"google-cloud-aiplatform[adk,agent_engines]>=1.88.0\",\n",
+    "    \"google-adk>=1.18.0\",\n",
+    "]\n",
+    "\n",
+    "!pip install --upgrade --quiet {\" \".join(REQUIREMENTS)}"
    ]
   },
   {
@@ -247,8 +251,10 @@
     "        tz = ZoneInfo(timezone)\n",
     "        now = datetime.datetime.now(tz)\n",
     "        return f\"The current time in {timezone} is {now.strftime('%Y-%m-%d %H:%M:%S %Z')}\"\n",
+    "    except ZoneInfoNotFoundError:\n",
+    "        return f\"Error: Timezone '{timezone}' not found. Please use a valid IANA timezone name (e.g., 'America/New_York', 'UTC').\"\n",
     "    except Exception as e:\n",
-    "        return f\"Error getting time for timezone {timezone}: {e}\"\n",
+    "        return f\"An unexpected error occurred while getting time for timezone {timezone}: {e}\"\n",
     "\n",
     "\n",
     "# Create the agent\n",
@@ -358,10 +364,7 @@
     "# This may take a few minutes\n",
     "remote_app = agent_engines.create(\n",
     "    app,\n",
-    "    requirements=[\n",
-    "        \"google-cloud-aiplatform[adk,agent_engines]>=1.88.0\",\n",
-    "        \"google-adk>=1.18.0\",\n",
-    "    ],\n",
+    "    requirements=REQUIREMENTS,\n",
     "    display_name=\"time-agent-inline\",\n",
     ")\n",
     "\n",