Flathub version is outdated (2.21.0 vs 2.24.0)

Expected

I expected the Flatpak version on Flathub to be updated to the latest stable release (2.24.0) to include recent features like ZIP import support and context menu fixes.
Observed

The Flatpak version is currently stuck at 2.21.0. The metadata shows the last update on Flathub occurred in late 2023, missing several minor and major updates released in this repository.
Reproduced

Open a terminal on any Linux distribution with Flatpak installed (e.g., Linux Mint).

Run flatpak remote-ls flathub | grep -i simplenote or flatpak info com.simplenote.Simplenote.

Observe that the available version is 2.21.0 while the GitHub Releases page shows 2.24.0.

Where did you see the bug

System Make: Generic x86_64 PC

System Model: Desktop/Laptop

OS: Linux Mint

OS version: 21.x / 22.x (Cinnamon Edition)

Browser (if applicable): N/A

Browser version (if applicable): N/A

Simplenote app version: 2.21.0 (Flatpak)

# Note for maintainers:
Output of flatpak info com.simplenote.Simplenote:
ID: com.simplenote.Simplenote
Version: 2.21.0
Runtime: org.freedesktop.Platform/x86_64/23.08
Commit: 3ca4b2d452b48321b4f2c2be2f24036876ff36b33b136b13c8b3265a3e233d33

Start by comparing the Flathub version from `flatpak info com.simplenote.Simplenote` with the GitHub Releases page, as described in the issue. The issue does not identify a repository file or update process; determine where the Flathub package is maintained and whether it can be updated to 2.24.0.

Written by the indexing model from the issue text.