build(deps): bump pillow-heif from 1.3.0 to 1.4.0 (#1516)

Bumps [pillow-heif](https://github.com/bigcat88/pillow_heif) from 1.3.0 to 1.4.0.
- [Release notes](https://github.com/bigcat88/pillow_heif/releases)
- [Changelog](https://github.com/bigcat88/pillow_heif/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bigcat88/pillow_heif/commits)

---
updated-dependencies:
- dependency-name: pillow-heif
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -4,5 +4,5 @@ xkcd==2.4.2
 pytz==2026.1.post1
 asyncpg==0.31.0
 python-Levenshtein==0.27.3
-pillow-heif==1.3.0
+pillow-heif==1.4.0
 markdownify==1.2.2