chore: remove workaround for setOutput (#374)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

src/context.ts

@@ -1,6 +1,5 @@
 import * as os from 'os';
 import * as core from '@actions/core';
-import {issueCommand} from '@actions/core/lib/command';
 
 export const osPlat: string = os.platform();
 export const osArch: string = os.arch();
@@ -22,8 +21,3 @@ export async function getInputs(): Promise<Inputs> {
     installOnly: core.getBooleanInput('install-only')
   };
 }
-
-// FIXME: Temp fix https://github.com/actions/toolkit/issues/777
-export function setOutput(name: string, value: unknown): void {
-  issueCommand('set-output', {name}, value);
-}