chore: update gitignore #6420

Job	Run time
get-lint-packages	5s
get-test-packages	4s
monorepo-lint	1m 2s
get-build-packages	5s
lint (eslint-plugin-isaacscript)	40s
lint (isaac-typescript-definitions)	37s
lint (docs)	38s
lint (eslint-config-isaacscript)	31s
lint (isaacscript-cli)	44s
lint (isaacscript-common)	1m 15s
lint (isaac-typescript-definitions-repentogon)	35s
lint (isaac-lua-polyfill)	35s
lint (isaacscript-spell)	29s
build (docs)	30s
build (isaac-typescript-definitions-repentogon)	29s
build (isaac-lua-polyfill)	25s
build (isaac-typescript-definitions)	26s
build (eslint-plugin-isaacscript)	26s
build (isaacscript-cli)	32s
build (isaacscript-common)	52s
test (isaacscript-cli)	25s
test (eslint-plugin-isaacscript)	28s
Discord Failure Notification	0s
	11m 53s

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