Fix post-release workflow failures

[cipolleschi]

Summary:

Fixes the three post-release failures from the 0.87.0-rc.2 publish run:

• Keep Flow annotations in verifyArtifactsAreOnMaven.js as comments so actions/github-script can load the file with plain Node.
• Pin the Podfile lock workflow to macos-15, which provides the configured Xcode 16.4 version.
• Use the canonical react/react-native owner for release asset API operations so upload POST requests are not redirected from the former owner.

Changelog:

[INTERNAL] [FIXED] - Fix post-release Maven verification, Podfile lock, and release asset jobs

Test Plan:

node --check .github/workflow-scripts/verifyArtifactsAreOnMaven.js
node --check scripts/releases/upload-release-assets-for-dotslash.js
yarn jest .github/workflow-scripts/__tests__/verifyArtifactsAreOnMaven-test.js scripts/releases/__tests__/upload-release-assets-for-dotslash-test.js --runInBand

13 tests and 15 snapshots pass.

[meta-codesync]

@cipolleschi has imported this pull request. If you are a Meta employee, you can view this in D113032768.

[meta-codesync]

@cipolleschi merged this pull request in 60fac2e.