Update macOS dependencies to r27

Description

Most notably, this MR brings back the camera icon in the main window.

Changes Made

• Downgrade adwaita-icon-theme to 44.0 in the macOS dependencies.
• Update Siril's CI to use new release r27 of said dependencies.

Related Issues

Issue regarding the camera icon was brought up in the chat.

Additional Notes

This MR affects only macOS CI.

Merge Request Checklists

• Code follows project coding guidelines and its checklist
• I have submitted a MR in the documentation repository if required
• I have updated Changelog and NEWS, listing the related issues.
• If my MR introduces new dependencies, I have run all the CIs, even the optional (manual) jobs.