Bump pytz from 2025.2 to 2026.1.post1 in /requirements

Bumps [pytz](https://github.com/stub42/pytz) from 2025.2 to 2026.1.post1.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2025.2...release_2026.1.post1)

---
updated-dependencies:
- dependency-name: pytz
  dependency-version: 2026.1.post1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements/prod.txt

@@ -951,9 +951,9 @@ python-dateutil==2.9.0.post0 \
     --hash=sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3 \
     --hash=sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427
 # pytz is required by Babel, celery
-pytz==2025.2 \
-    --hash=sha256:360b9e3dbb49a209c21ad61809c7fb453643e048b38924c765813546746e81c3 \
-    --hash=sha256:5ddf76296dd8c44c26eb8f4b6f35488f3ccbf6fbbd7adee0b7262d43f0ec2f00
+pytz==2026.1.post1 \
+    --hash=sha256:3378dde6a0c3d26719182142c56e60c7f9af7e968076f31aae569d72a0358ee1 \
+    --hash=sha256:f2fd16142fda348286a75e1a524be810bb05d444e5a081f37f7affc635035f7a
 sentry-sdk==2.54.0 \
     --hash=sha256:2620c2575128d009b11b20f7feb81e4e4e8ae08ec1d36cbc845705060b45cc1b \
     --hash=sha256:fd74e0e281dcda63afff095d23ebcd6e97006102cdc8e78a29f19ecdf796a0de