chore(release): open dev at 2.75.0 before releasing 2.74.0

[github-actions]

Summary

2.74.0 is about to be released. Merging this first means dev already outranks the new tag when it lands, so neither dev nor any open pull request ever inherits the version-line failure. release.yml refuses to publish until this has merged.

This moves dev to 2.75.0 in package.json and the desktop version
sources (tauri.conf.json, Cargo.toml, and the opencodex-desktop entry of Cargo.lock).

Opened automatically by .github/workflows/dev-version-bump.yml. The same
version-line move was previously done by hand in 32529c2, e4a85d1, 076ad30, and
befcac3.

Verification

The workflow proved 2.74.0 has neither a Git tag nor an npm publication, and bun test tests/ci-workflows/release-version-line.test.ts proved the chosen development version is unused.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults.

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[lidge-jun]

Maintainer integration (MAINTAINERS.md, 2026-09-06 policy): @lidge-jun (admin) is merging this workflow-generated dev pre-move without a second approval, as the release procedure requires before publishing 2.74.0 ("Opening a release starts by moving dev's version line forward"). The diff is exactly the four version sources (package.json, desktop Cargo.toml/Cargo.lock, tauri.conf.json) moving 2.74.0 → 2.75.0; no code changes. Release authorization: the repository owner asked to stabilize and release on 2026-09-30.