Use getBooleanInput to get ignore_sha and all_but_latest

[Warashi]

cancel-workflow-action/src/index.ts

Lines 35 to 36 in ad6cb1b

	const ignore_sha = core.getInput('ignore_sha', { required: false }) === 'true';
	const all_but_latest = core.getInput('all_but_latest', { required: false });

ignore_sha and all_but_latest option is got with getInput method, but there is getBooleanInput.
ref: https://github.com/actions/toolkit/tree/main/packages/core#inputsoutputs

[styfle]

Thanks, do you want to create a PR to fix it and test it?

[Warashi]

Thanks for the reply.
I've never written Typescript before, but I'm going to give it a try.