[WIP] Build(deps): Bump the ICU group with 4 updates

[Copilot]

• Analyze the breaking changes from ICU4X 2.0/2.1
• Update all ICU dependencies in Cargo.toml to stable 2.1.1 versions
  • icu_calendar: 1.5.2 → 2.1.1
  • icu_datetime: 1.5.1 → 2.1.1
  • icu_experimental: 0.2.0 → 0.4.0
  • icu_plurals: 1.5.0 → 2.1.1
  • icu_provider: 1.5.0 → 2.1.1
  • icu_provider_adapters: 1.5.0 → 2.1.1
  • icu_normalizer: 1.5.0 → 2.1.1
  • writeable: 0.5.5 → 0.6.2
  • Replace deprecated icu_locid and icu_locid_transform with icu_locale and icu_locale_core
• Update code in crates/i18n/src/translator.rs to match new API
  • Replace LocaleFallbackerWithConfig with LocaleFallbacker
  • Replace DataKey with DataMarkerInfo (removed data key usage)
  • Update PluralRules to use new try_new_cardinal API
  • Update RelativeTimeFormatter to use new preferences API
  • Extract data_locale_to_locale helper function to reduce duplication
  • Replace is_und() with is_unknown()
• Update code in crates/i18n/src/lib.rs to use new exports
• Update code in crates/axum-utils/src/language_detection.rs
  • Replace try_from_bytes with try_from_utf8
• Update code in crates/templates/src/functions.rs
  • Replace IsoTimeInput trait adapter with direct Time struct usage
• Update code in crates/handlers/src/passwords.rs
  • Fix normalize() return type (Cow to String)
• Update code in crates/handlers/src/oauth2/token.rs
  • Fix locale parsing error handling with logging
• Build and test the changes
• Run code review and address feedback

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