Fix core to add getBooleanInput to __fixtures__

Author: yutailang0119

__fixtures__/core.ts

@@ -5,6 +5,7 @@ export const debug = jest.fn<typeof core.debug>()
 export const error = jest.fn<typeof core.error>()
 export const info = jest.fn<typeof core.info>()
 export const getInput = jest.fn<typeof core.getInput>()
+export const getBooleanInput = jest.fn<typeof core.getBooleanInput>()
 export const setOutput = jest.fn<typeof core.setOutput>()
 export const setFailed = jest.fn<typeof core.setFailed>()
 export const warning = jest.fn<typeof core.warning>()