chore: upgrade flint to v0.22.2

[zeitlinger]

What changed

• upgraded the Flint runtime in mise.toml to aqua:grafana/flint@0.22.2
• migrated obsolete tool declarations that Flint now rewrites automatically
• replaced codespell with typos
• refreshed .github/renovate-tracked-deps.json
• added targeted regex-based _typos.toml ignores for intentional tokens and fixture content

Why

This validates the Flint v0.22.2 rollout on another consumer repo using the same migration policy:

• no source-content rewrites to satisfy typos
• use targeted regex ignores instead of broad word allowlists where practical
• leave Renovate preset bumps to Renovate

Validation

• mise run lint

Notes

• mise run test failed in this checkout, but the failure appears unrelated to this Flint-only config change. The failing tests error on Java Map.of(...) compilation in existing test sources under prometheus-metrics-config.