ci: Automate version bump to v2.1.1

[illuzen]

Automated version bump for release v2.1.1.

https://github.com/Quantus-Network/quantus-cli/actions/runs/31474570839

Triggered by workflow run: patch

Type:

[n13]

Reviewer model: GPT Sol

APPROVE — The v2.1.1 release bump is internally consistent and ready to merge.

No blocking findings.

I reviewed the exact range 6ceffc5ce7f57f60e5e915d431a7956981287928...bf0bc590a4f32464d2edbe18a6a0de1cae503a68. The complete diff changes only the package version in Cargo.toml and the matching root quantus-cli entry in Cargo.lock. v2.1.0 is the latest existing version tag, v2.1.1 does not already exist, the PR head directly descends the recorded base, and the title plus release-proposal label satisfy the repository's release trigger.

Validation:

• git diff --check 6ceffc5...bf0bc590 — passed.
• cargo metadata --locked --no-deps --format-version 1 — passed and reports quantus-cli 2.1.1.
• cargo +nightly fmt --all -- --check — passed.
• cargo package --locked --no-verify --allow-dirty --list — passed without changing the worktree.
• Exact-head GitHub CI — all six jobs passed: format, Ubuntu and macOS build/test, clippy/docs, security audit, and examples.