Fix: Fix HookMatcher.timeout type to float (#357)

According to https://www.schemastore.org/claude-code-settings.json, the
`timeout` type is `number`, not `integer`

Signed-off-by: harupy <17039389+harupy@users.noreply.github.com>

Author: harupy

src/claude_agent_sdk/types.py

@@ -367,7 +367,7 @@ class HookMatcher:
     hooks: list[HookCallback] = field(default_factory=list)
 
     # Timeout in seconds for all hooks in this matcher (default: 60)
-    timeout: int | None = None
+    timeout: float | None = None
 
 
 # MCP Server config