fix(time): Fix McpError constructor usage in time server

Fixes CI failures in PR #3220.

PR #3220 updated `mcp` library from 1.0.0 to 1.23.0, which caused test
failures due to a breaking change in `McpError` constructor API.

The `McpError` constructor now expects an `ErrorData` object instead of
a plain string message. This commit fixes the usage in `get_zoneinfo()`
function to use `ErrorData(code=INVALID_PARAMS, message=...)`.

```console
Error before fix:
  AttributeError: 'str' object has no attribute 'message'
```

Also updates `mcp` dependency to >=1.23.0 in pyproject.toml to ensure
compatibility with the new API.

src/time/pyproject.toml

@@ -17,10 +17,10 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
 ]
 dependencies = [
-    "mcp>=1.0.0",
+    "mcp>=1.23.0",
     "pydantic>=2.0.0",
     "tzdata>=2024.2",
-    "tzlocal>=5.3.1"
+    "tzlocal>=5.3.1",
 ]
 
 [project.scripts]