[Bug 2107950] [NEW] tzdata 2025b ICU data update

[Benjamin Drung]

Public bug reported:

[ Impact ]

The ICU data we embed in tzdata was out of sync with the 2025b SRUs (bug
#2104284) because they were not released back then. We need to do
another round of SRUs.

[ Test Plan ]

Test cases were added to the autopkgtest to cover the testing:

* python-icu: test_2025b

So the test plan is to check that the autopkgtest succeeds.

[ Other Info ]

* The autopkgtest for chrony is flaky on jammy and newer (see bug #2002910).
* The oracular autopkgtest needs to use exchange-calendars/4.5.5-2ubuntu0.1
* The focal autopkgtest needs to use postgresql-12/12.22-0ubuntu0.20.04.3

** Affects: tzdata (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: tzdata (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Affects: tzdata (Ubuntu Jammy)
     Importance: Undecided
         Status: New

** Affects: tzdata (Ubuntu Noble)
     Importance: Undecided
         Status: New

** Affects: tzdata (Ubuntu Oracular)
     Importance: Undecided
         Status: New

** Affects: tzdata (Ubuntu Plucky)
     Importance: Undecided
         Status: New

** Also affects: tzdata (Ubuntu Plucky)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Focal)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Oracular)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Also affects: tzdata (Ubuntu Jammy)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/2107950

Title:
  tzdata 2025b ICU data update

Status in tzdata package in Ubuntu:
  New
Status in tzdata source package in Focal:
  New
Status in tzdata source package in Jammy:
  New
Status in tzdata source package in Noble:
  New
Status in tzdata source package in Oracular:
  New
Status in tzdata source package in Plucky:
  New

Bug description:
  [ Impact ]

  The ICU data we embed in tzdata was out of sync with the 2025b SRUs
  (bug #2104284) because they were not released back then. We need to do
  another round of SRUs.

  [ Test Plan ]

  Test cases were added to the autopkgtest to cover the testing:

  * python-icu: test_2025b

  So the test plan is to check that the autopkgtest succeeds.

  [ Other Info ]

  * The autopkgtest for chrony is flaky on jammy and newer (see bug #2002910).
  * The oracular autopkgtest needs to use exchange-calendars/4.5.5-2ubuntu0.1
  * The focal autopkgtest needs to use postgresql-12/12.22-0ubuntu0.20.04.3

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