[ci][macos] Bump macOS workflow to Xcode 26.4.1 and fmt to 12.1.0

[tsapeta]

Why

Two related fixes for the macOS Test Suite workflow:

1. Xcode bump. test-suite-macos.yml was still pinned to Xcode 26.2 — it missed the repo-wide bump to 26.4.1 ([ci] bump xcode to 26.4, use maestro 2.4.0 on android #46160) because the workflow was added afterward ([network][macOS] Add macOS platform support #46535). Every other iOS workflow is on 26.4.1.

2. fmt bump. 26.4.1's Clang fails to compile fmt 11.0.2 (fmt/src/format.cc), which react-native-macos@0.81.7 still pulls in via its third-party-podspecs/fmt.podspec. This bumps the pinned fmt to 12.1.0 — the same fix React Native made upstream in Bump fmt to 12.1.0 to fix xcode 26.4 react/react-native#56099 — applied through the existing macOS react-native-macos patch (apps/bare-expo/scripts/fixtures/macos/patches/).

What

• .github/workflows/test-suite-macos.yml: switch to Xcode 26.4.1.
• apps/bare-expo/scripts/fixtures/macos/patches/react-native-macos@0.81.7.patch: add a hunk bumping fmt.podspec spec.version/:tag from 11.0.2 to 12.1.0. The setup script copies this into patches/ and registers it in pnpm-workspace.yaml.

Test plan

• The macOS Test Suite workflow runs on this PR and should now build on 26.4.1 with fmt 12.1.0.
• Verified the patch hunk applies cleanly to the installed react-native-macos@0.81.7 fmt.podspec (git apply --check).

Surfaced while bumping the same workflow on #46555; this splits the macOS-CI fixes out so that PR stays focused on the Module.emit feature.

[expo-bot]

The Pull Request introduced fingerprint changes against the base commit: c16cce5

Fingerprint diff

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---

Generated by PR labeler 🤖

[tsapeta]

Pushed the lockfile fix. The fmt bump needed two more pieces beyond fmt.podspec:

• RCT-Folly.podspec pins fmt to an exact version (spec.dependency "fmt", "11.0.2"), so it had to be bumped to 12.1.0 too — otherwise CocoaPods can't resolve a compatible fmt ("could not find compatible versions for pod fmt"). This matches what Bump fmt to 12.1.0 to fix xcode 26.4 react/react-native#56099 did (it bumped the pin everywhere, not just the fmt podspec).
• Regenerated apps/bare-expo/macos/Podfile.lock via pod update fmt so the committed lock matches what pod install produces (fmt 12.1.0 + refreshed checksums). Reproduced the original CI failure locally and confirmed pod install now completes with Installing fmt (12.1.0) and Podfile.lock == Pods/Manifest.lock.

[github-actions]

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