build(deps): bump tzdata from 2026.4 to 2026.5 in /.github/requirements

[dependabot]

Repair automated lock regeneration: keep tzdata in shared integration inputs on every compiler host, preserve the hashed setuptools backend through pip-tools/Dependabot configuration, and regenerate the universal Python 3.12 integration lock. Cryptography #115 also restores the publish lock backend. Package runtime dependency markers remain platform-specific.

Validation: all 37 workflow tests pass on each repaired branch; the common repair passed the full local suite (5390 passed, 230 optional skips), Ruff lint/format and mypy (275 files). Linux/macOS/Windows compiler regressions ensure timezone data stays in the shared input. Merge only after all remote CI, integration services and quality checks pass on the reviewed head.

Bumps tzdata from 2026.4 to 2026.5.

Release notes

Sourced from tzdata's releases.

2026.5: Release of upstream tzdata 2026e

Version 2026.5

Upstream version 2026e released 2026-09-30T00:14:38+00:00.

Briefly:

Manitoba moves to permanent -05 on 2026-10-31.

Changes to future timestamps

Manitoba’s 2026-03-08 spring forward was its last foreseeable clock change, as it moved to permanent -05 thereafter. Model this with its traditional abbreviation EST. Although the change to permanent -05 legally takes place on 2026-10-31, temporarily model the change to occur on 2026-11-01 at 02:00 for the same reason as other recent temporary hacks. (Caution: see “NOTE FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA” below.)

As the change affects both America/Winnipeg and its backward compatibility link, the obsolescent setting TZ="Canada/Central" will now use the abbreviation EST for affected timestamps, akin to TZ="Canada/Pacific" behavior introduced in 2026b.

Another TZDB release may be needed soon if any of the portions of northwestern Ontario historically aligned with America/Winnipeg do not follow. For now, given the short leadtime with Manitoba’s announcement, assume that they will, to avoid creating new zones that may not be needed if no divergence occurs.

Changes to past timestamps

In 1925 Ireland fell back on 09-20 not 10-04 (thanks to Stan Ulbrych).

Changes to commentary

Discussion on timekeeping practices in northwestern Ontario has been expanded in light of Manitoba’s recent announcement. It is not yet known whether or to what extent these areas may adapt their own timekeeping practices in response.

Changelog

Sourced from tzdata's changelog.

Version 2026.5

Upstream version 2026e released 2026-09-30T00:14:38+00:00

Briefly:

Manitoba moves to permanent -05 on 2026-10-31.

Changes to future timestamps

Manitoba’s 2026-03-08 spring forward was its last foreseeable clock change, as it moved to permanent -05 thereafter. Model this with its traditional abbreviation EST. Although the change to permanent -05 legally takes place on 2026-10-31, temporarily model the change to occur on 2026-11-01 at 02:00 for the same reason as other recent temporary hacks. (Caution: see “NOTE FOR 2026b TEMPORARY HACK FOR CLDR AND CANADA” below.)

As the change affects both America/Winnipeg and its backward compatibility link, the obsolescent setting TZ="Canada/Central" will now use the abbreviation EST for affected timestamps, akin to TZ="Canada/Pacific" behavior introduced in 2026b.

Another TZDB release may be needed soon if any of the portions of northwestern Ontario historically aligned with America/Winnipeg do not follow. For now, given the short leadtime with Manitoba’s announcement, assume that they will, to avoid creating new zones that may not be needed if no divergence occurs.

Changes to past timestamps

In 1925 Ireland fell back on 09-20 not 10-04 (thanks to Stan Ulbrych).

Changes to commentary

Discussion on timekeeping practices in northwestern Ontario has been expanded in light of Manitoba’s recent announcement. It is not yet known whether or to what extent these areas may adapt their own timekeeping practices in response.

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Commits

• 9493aab Update tzdata to version 2026e (#154)
• See full diff in compare view

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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0 new issues

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🟢 Metrics 6 complexity · 0 duplication

Metric	Results
Complexity	6
Duplication	0

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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