chore(deps): bump pytz from 2025.2 to 2026.2 in /preprocessing/nextclade (#6556)

Bumps pytz from 2025.2 to 2026.2.

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preprocessing/nextclade/environment.yml

@@ -12,7 +12,7 @@ dependencies:
   - pyyaml=6.0.3
   - pyjwt=2.13.0
   - python-dateutil=2.9.0.post0
-  - pytz=2025.2
+  - pytz=2026.2
   - requests=2.34.2
   - pandas=3.0.3
   - ruff=0.15.15