Fix page return type #2732

Job	Run time
Build Flet Flutter package	1m 25s
Build Documentation	3m 14s
Python 3.10 tests	27s
Python 3.14 tests	23s
Python 3.12 tests	25s
Python 3.13 tests	24s
Python 3.11 tests	25s
Build Flet extensions	4m 32s
Build Flet Client for Windows	7m 15s
Package templates	16s
Build Flet Client for Web	4m 19s
Build Flet Client for macOS	5m 56s
Build flet, flet-cli and flet-desktop Python packages	30s
Build Flet Client for Linux Debian 10 ARM64	8m 7s
Build Flet Client for Linux Debian 10 AMD64	5m 8s
Build Flet Client for Linux Debian 12 AMD64	4m 56s
Build Flet Client for Linux Debian 12 ARM64	5m 32s
Build Flet Client for Linux Ubuntu 24.04 ARM64	6m 22s
Build Flet Client for Linux Ubuntu 24.04 AMD64	5m 16s
Build Flet Client for Linux Ubuntu 20.04 ARM64	6m 32s
Build Flet Client for Linux Ubuntu 20.04 AMD64	5m 44s
Build Flet Client for Linux Ubuntu 22.04 ARM64	5m 28s
Build Flet Client for Linux Ubuntu 22.04 AMD64	4m 47s
Publish GitHub Release	0s
Publish Python packages to PyPI	0s
	1h 27m 23s

Provide feedback