build(deps): bump propcache from 0.5.2 to 0.5.4 in /packaging/flatpak

[dependabot]

Bumps propcache from 0.5.2 to 0.5.4.

Release notes

Sourced from propcache's releases.

0.5.4

Packaging updates and notes for downstreams

• Fixed the release wheels being compiled without optimization since version 0.5.0. The build backend set CFLAGS to add -ffile-prefix-map, which replaced the interpreter's own compiler flags instead of extending them, so -O3 and -DNDEBUG were dropped; the extra flags now go through CPPFLAGS, which is appended. Cached property reads are about 1.5x faster than in 0.5.3 -- by :user:bdraco.

  Related issues and pull requests on GitHub: #244, #302.

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0.5.3

Bug fixes

• Fixed a possible crash in the C implementation of cached_property and under_cached_property on free-threaded Python, where a cached value could be freed by another thread while it was being read; errors raised while looking up the cache are now propagated on all builds, and the computed value is no longer leaked if storing it fails -- by :user:bdraco.

  Related issues and pull requests on GitHub: #297.

Removals and backward incompatible breaking changes

• Dropped support for free-threaded Python 3.13 -- by :user:Vizonex.

  Related issues and pull requests on GitHub: #223.

Improved documentation

• Updated discussion links from the defunct Google Groups forum to GitHub Discussions -- by :user:gundalow.

  Related issues and pull requests on GitHub:

... (truncated)

Changelog

Sourced from propcache's changelog.

0.5.4

(2026-09-15)

Packaging updates and notes for downstreams

• Fixed the release wheels being compiled without optimization since version 0.5.0. The build backend set CFLAGS to add -ffile-prefix-map, which replaced the interpreter's own compiler flags instead of extending them, so -O3 and -DNDEBUG were dropped; the extra flags now go through CPPFLAGS, which is appended. Cached property reads are about 1.5x faster than in 0.5.3 -- by :user:bdraco.

  Related issues and pull requests on GitHub: :issue:244, :issue:302.

---

0.5.3

(2026-09-15)

Bug fixes

• Fixed a possible crash in the C implementation of cached_property and under_cached_property on free-threaded Python, where a cached value could be freed by another thread while it was being read; errors raised while looking up the cache are now propagated on all builds, and the computed value is no longer leaked if storing it fails -- by :user:bdraco.

  Related issues and pull requests on GitHub: :issue:297.

Removals and backward incompatible breaking changes

• Dropped support for free-threaded Python 3.13 -- by :user:Vizonex.

  Related issues and pull requests on GitHub:

... (truncated)

Commits

• cc9882f Release 0.5.4 (#303)
• 4ea72db Pass extra build flags through CPPFLAGS so wheels keep -O3 (#302)
• 98b92bc Bump version to 0.5.4.dev0 (#301)
• d7b6afa Release 0.5.3 (#298)
• 36b96a5 Skip in-build wheel tests off-tag (#300)
• e514a4f Drop the deprecated license classifier (#299)
• 3447e83 Make under_cached_property and cached_property safe for free-threading (#...
• 19f4e0e [pre-commit.ci] pre-commit autoupdate (#264)
• fe44b45 Discussion should be in GH Org (#217)
• c48781a Bump astral-sh/setup-uv from 10.0.1 to 10.1.0 (#296)
• Additional commits viewable in compare view

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