Update dependency eslint to v9.27.0

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
eslint (source)	devDependencies	minor	9.26.0 -> 9.27.0

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Release Notes

eslint/eslint (eslint)

v9.27.0

Compare Source

Features

• d71e37f feat: Allow flags to be set in ESLINT_FLAGS env variable (#​19717) (Nicholas C. Zakas)
• ba456e0 feat: Externalize MCP server (#​19699) (Nicholas C. Zakas)
• 07c1a7e feat: add allowRegexCharacters to no-useless-escape (#​19705) (sethamus)
• 7bc6c71 feat: add no-unassigned-vars rule (#​19618) (Jacob Bandes-Storch)
• ee40364 feat: convert no-array-constructor suggestions to autofixes (#​19621) (sethamus)
• 32957cd feat: support TS syntax in max-params (#​19557) (Nitin Kumar)

Bug Fixes

• 5687ce7 fix: correct mismatched removed rules (#​19734) (루밀LuMir)
• dc5ed33 fix: correct types and tighten type definitions in SourceCode class (#​19731) (루밀LuMir)
• de1b5de fix: correct service property name in Linter.ESLintParseResult type (#​19713) (Francesco Trotta)
• 60c3e2c fix: sort keys in eslint-suppressions.json to avoid git churn (#​19711) (Ron Waldon-Howe)
• 9da90ca fix: add allowReserved to Linter.ParserOptions type (#​19710) (Francesco Trotta)
• fbb8be9 fix: add info to ESLint.DeprecatedRuleUse type (#​19701) (Francesco Trotta)

Documentation

• 25de550 docs: Update description of frozen rules to mention TypeScript (#​19736) (Nicholas C. Zakas)
• bd5def6 docs: Clean up configuration files docs (#​19735) (Nicholas C. Zakas)
• 4d0c60d docs: Add Neovim to editor integrations (#​19729) (Maria José Solano)
• 71317eb docs: Update README (GitHub Actions Bot)
• 4c289e6 docs: Update README (GitHub Actions Bot)
• f0f0d46 docs: clarify that unused suppressions cause non-zero exit code (#​19698) (Milos Djermanovic)
• 8ed3273 docs: fix internal usages of ConfigData type (#​19688) (Francesco Trotta)
• eb316a8 docs: add fmt and check sections to Package.json Conventions (#​19686) (루밀LuMir)
• a3a2559 docs: fix wording in Combine Configs (#​19685) (Milos Djermanovic)
• c8d17e1 docs: Update README (GitHub Actions Bot)

Chores

• f8f1560 chore: upgrade @​eslint/js@​9.27.0 (#​19739) (Milos Djermanovic)
• ecaef73 chore: package.json update for @​eslint/js release (Jenkins)
• 596fdc6 chore: update dependency @​arethetypeswrong/cli to ^0.18.0 (#​19732) (renovate[bot])
• f791da0 chore: remove unbalanced curly brace from .editorconfig (#​19730) (Maria José Solano)
• e86edee refactor: Consolidate Config helpers (#​19675) (Nicholas C. Zakas)
• cf36352 chore: remove shared types (#​19718) (Francesco Trotta)
• f60f276 refactor: Easier RuleContext creation (#​19709) (Nicholas C. Zakas)
• 58a171e chore: update dependency @​eslint/plugin-kit to ^0.3.1 (#​19712) (renovate[bot])
• 3a075a2 chore: update dependency @​eslint/core to ^0.14.0 (#​19715) (renovate[bot])
• 44bac9d ci: run tests in Node.js 24 (#​19702) (Francesco Trotta)
• 35304dd chore: add missing funding field to packages (#​19684) (루밀LuMir)
• f305beb test: mock process.emitWarning to prevent output disruption (#​19687) (Francesco Trotta)

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