Update eslint monorepo

This MR contains the following updates:

Package	Type	Update	Change
@eslint/js (source)	devDependencies	minor	9.19.0 -> 9.20.0
eslint (source)	devDependencies	minor	9.19.0 -> 9.20.1

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Release Notes

eslint/eslint (@​eslint/js)

v9.20.0

Compare Source

Features

• e89a54a feat: change behavior of inactive flags (#​19386) (Milos Djermanovic)

Bug Fixes

• 91d4d9f fix: Bring types in sync with @​eslint/core (#​19157) (Nicholas C. Zakas)
• fa25c7a fix: Emit warning when empty config file is used (#​19399) (Nicholas C. Zakas)
• 31a9fd0 fix: Clearer error message for wrong plugin format (#​19380) (Nicholas C. Zakas)
• 61d99e3 fix: Better error message for unserializable parser (#​19384) (Nicholas C. Zakas)
• db1b9a6 fix: Ensure module scope is checked for references in consistent-this (#​19383) (Nicholas C. Zakas)
• 8bcd820 fix: arrow-body-style crash with single-token body (#​19379) (Milos Djermanovic)

Documentation

• b7012c8 docs: rewrite examples with var using let and const (#​19407) (Mueez Javaid Hashmi)
• 6406376 docs: Update README (GitHub Actions Bot)
• 350f2b9 docs: rewrite some examples with var using let and const (#​19404) (Mueez Javaid Hashmi)
• 93c325a docs: rewrite examples with var using let and const (#​19398) (Mueez Javaid Hashmi)
• 56ff404 docs: replace var with let or const in rules docs (#​19396) (Daniel Harbrueger)
• 4053226 docs: change sourceType in no-eval examples (#​19393) (Milos Djermanovic)
• 1324af0 docs: replace var with let and const in rules docs (#​19392) (Daniel Harbrueger)
• 8b87e00 docs: replace var with const and let in rules (#​19389) (Tanuj Kanti)
• 758c66b docs: Explain what frozen rules mean (#​19382) (Nicholas C. Zakas)
• 0ef8bb8 docs: additional checks for rule examples (#​19358) (Milos Djermanovic)
• 58ab2f6 docs: fix order of installation steps in getting started (#​19326) (Tanuj Kanti)

Chores

• 979097a chore: upgrade @​eslint/js@​9.20.0 (#​19412) (Francesco Trotta)
• 031734e chore: package.json update for @​eslint/js release (Jenkins)
• d4c47c3 test: avoid empty config warning in test output (#​19408) (Milos Djermanovic)
• 67dd82a chore: update dependency @​eslint/json to ^0.10.0 (#​19387) (renovate[bot])
• 15ac0e1 chore: add permissions: read-all to stale.yml workflow (#​19374) (Josh Goldberg ✨)

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