Bump libcosmic from 2f02228 to 0304f1d

[dependabot]

Bumps libcosmic from 2f02228 to 0304f1d.

Commits

• 0304f1d fix: detect SVG icons by content
• d4d71fd improv: better downsampler for small target images
• b728852 chore: update iced
• 6347ba2 fix: keep content's overlays visible while showing toaster
• 9cc82ab fix: don't pass keyboard events to content if popover modal is open
• c3ced76 feat: update cosmic-icons
• c003a58 feat(iced): hide-cursor and multi-popup features
• caec74c fix(menu example): fix key binds not being dispatched
• 3b62210 fix(menu): request redraw when menu bar opens
• 2a73fbc fix(segmented_button): request redraw on tab focus shift
• Additional commits viewable in compare view

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Summary by cubic

Updates libcosmic from 2f02228 to 0304f1d, pulling in upstream fixes and features. Only Cargo.lock is affected.

Highlights

• SVG icons are detected by content instead of filename extension.
• Keyboard events no longer reach content while a popover modal is open.
• iced adds hide-cursor and multi-popup features.
• New build_helpers, hex_color, and redox_event crates are added.

^{Written for commit fdb5f21. Summary will update on new commits.}

[dependabot]

Superseded by #35.