chore: Upgrade package dependencies to compatible latests

[mrousavy]

Summary

Consolidates the remaining package-upgrade PRs into one PR:

• Upgrades Prettier to 3.8.3 and eslint-config-prettier to 10.1.8.
• Runs Prettier directly from the workspace lint scripts, so local lint-ci and CI fail on formatting issues instead of relying on eslint-plugin-prettier warnings.
• Upgrades CocoaPods to 1.16.2, xcodeproj to 1.27.0, ActiveSupport to the latest CocoaPods-compatible 7.2.x line, and Ruby stdlib gems where allowed.
• Removes the unused @expo/config-plugins dependency.
• Regenerates bun.lock, Gemfile.lock, and Podfile.lock from latest main so the Pod graph keeps react-native-safe-area-context 5.8.0.
• Uses Ruby 3.4.9 in iOS/update-lockfiles workflows, matching the generated Gemfile.lock.
• Keeps Jest on 29.7.0 and @types/jest on 29.5.14 with no overrides. Jest 30.2/30.3/30.4 fail with @react-native/jest-preset@0.85.3 because the preset still depends on Jest 29 internals; revisit when the RN preset migrates.
• Keeps ESLint on 8.57.1. ESLint 9 works only after the RN flat-config path, but @react-native/eslint-config@0.85.3 currently pulls eslint-plugin-ft-flow@2.x, which crashes on ESLint 9. Forcing that would require an override/resolution workaround, so this PR avoids it.

Supersedes #1047, #1049, #1055, and #1058.

Validation

• Negative control: a TypeScript type error fails bun typecheck.
• Negative control: an unused variable fails bun --cwd packages/react-native-mmkv lint-ci.
• Negative control: formatting-only changes fail bun --cwd packages/react-native-mmkv lint-ci and bun --cwd example lint-ci.
• bun install --force
• bun lint-ci
• bun lint && git diff --exit-code HEAD -- . ':(exclude)bun.lock'
• bun typecheck
• bun run test
• git diff --check
• bun outdated -r
• bun audit
• previously on this PR: Android debug build and iOS generic simulator build passed locally