Update dependency grafana/flint to v0.21.0

[renovate]

This PR contains the following updates:

Package	Update	Change
grafana/flint	minor	v0.20.3 → v0.21.0

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Release Notes

grafana/flint (grafana/flint)

v0.21.0

Compare Source

Added

• add flint setup preflight migrations (#​233)
• support managed linter configs and aqua-backed tool keys (#​228)
• switch xmloxide to github backend (#​229)
• add taplo formatter check (#​224)
• (init) configure line length during init (#​218)

Fixed

• support renovate v43.136.3 (#​223)
• switch yaml-lint to ryl (#​226)
• (ruff) install via github releases (#​227)
• resolve init rollout regressions (#​220)

Other

• reduce fake-bin fixture coverage (#​240)
• (deps) update dependency npm:renovate to v43.141.1 (#​221)
• guard fixture case groups (#​238)
• (deps) update dependency grafana/flint to v0.20.4 (#​235)
• (deps) lock file maintenance (#​237)
• (deps) update dependency mise to v2026.4.19 (#​236)
• (deps) update rust crate json5 to v1 (#​232)
• (deps) update taiki-e/install-action digest to 787505c (#​219)
• (deps) update dependency grafana/flint to v0.20.3 (#​225)

v0.20.4

Compare Source

Added

• add flint setup preflight migrations (#​233)
• support managed linter configs and aqua-backed tool keys (#​228)
• switch xmloxide to github backend (#​229)
• add taplo formatter check (#​224)
• (init) configure line length during init (#​218)

Fixed

• support renovate v43.136.3 (#​223)
• switch yaml-lint to ryl (#​226)
• (ruff) install via github releases (#​227)
• resolve init rollout regressions (#​220)

Other

• reduce fake-bin fixture coverage (#​240)
• (deps) update dependency npm:renovate to v43.141.1 (#​221)
• guard fixture case groups (#​238)
• (deps) update dependency grafana/flint to v0.20.4 (#​235)
• (deps) lock file maintenance (#​237)
• (deps) update dependency mise to v2026.4.19 (#​236)
• (deps) update rust crate json5 to v1 (#​232)
• (deps) update taiki-e/install-action digest to 787505c (#​219)
• (deps) update dependency grafana/flint to v0.20.3 (#​225)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.27%. Comparing base (951ff73) to head (103a6b6).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8336   +/-   ##
=========================================
  Coverage     90.27%   90.27%           
  Complexity     7693     7693           
=========================================
  Files           850      850           
  Lines         23207    23207           
  Branches       2356     2356           
=========================================
  Hits          20951    20951           
  Misses         1530     1530           
  Partials        726      726           

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