fix: pip invocation on windows #6665

Job	Run time
monorepo-lint	55s
get-test-packages	5s
get-lint-packages	6s
get-build-packages	5s
build (isaac-typescript-definitions-repentogon)	33s
build (eslint-plugin-isaacscript)	31s
build (isaac-lua-polyfill)	30s
build (docs)	33s
build (isaacscript-common)	50s
build (isaac-typescript-definitions)	33s
build (isaacscript-cli)	35s
lint (eslint-config-isaacscript)	34s
lint (eslint-plugin-isaacscript)	45s
lint (isaac-typescript-definitions-repentogon)	43s
lint (isaac-typescript-definitions)	47s
lint (isaac-lua-polyfill)	34s
lint (isaacscript-spell)	31s
lint (isaacscript-cli)	46s
lint (docs)	37s
lint (isaacscript-common)	1m 10s
test (isaacscript-cli)	27s
test (eslint-plugin-isaacscript)	32s
Discord Failure Notification	0s
	12m 42s

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