Bump tzdata from 2025.3 to 2026.1

Bumps [tzdata](https://github.com/python/tzdata) from 2025.3 to 2026.1.
- [Release notes](https://github.com/python/tzdata/releases)
- [Changelog](https://github.com/python/tzdata/blob/master/NEWS.md)
- [Commits](python/tzdata@2025.3...2026.1)

---
updated-dependencies:
- dependency-name: tzdata
  dependency-version: '2026.1'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -2,4 +2,4 @@ sorunlib==0.1.33
 nextline-schedule==0.5.3
 nextline-alert==0.10.1
 nextline-rdb==0.7.1
-tzdata==2025.3
+tzdata==2026.1