Revert "feat!: run the action on Node.js 24 (#205)"

This reverts commit 9b5745cdf0.

src/install-pnpm/run.ts

@@ -5,7 +5,6 @@ import { readFileSync } from 'fs'
 import path from 'path'
 import { execPath } from 'process'
 import util from 'util'
-import * as yaml from 'yaml'
 import { Inputs } from '../inputs'
 import { parse as parseYaml } from 'yaml'
 
@@ -96,18 +95,10 @@ Otherwise, please specify the pnpm version in the action configuration.`)
   }
 
   if (typeof packageManager !== 'string') {
-    if (GITHUB_WORKSPACE) {
-      try {
-        const { lockfileVersion } = yaml.parse(readFileSync(path.join(GITHUB_WORKSPACE, 'pnpm-lock.yaml'), 'utf8'))
-        const version = getPnpmVersionFromLockfile(lockfileVersion);
-        return `${ standalone ? '@pnpm/exe' : 'pnpm' }@${version}`
-      } catch (error: unknown) {
-        throw new Error(`No pnpm version is specified.
+    throw new Error(`No pnpm version is specified.
 Please specify it by one of the following ways:
   - in the GitHub Action config with the key "version"
   - in the package.json with the key "packageManager"`)
-      }
-    }
   }
 
   if (!packageManager.startsWith('pnpm@')) {
@@ -121,21 +112,4 @@ Please specify it by one of the following ways:
   return packageManager
 }
 
-function getPnpmVersionFromLockfile(
-  lockfileVersion: string | undefined
-): string | undefined {
-  switch (true) {
-    case lockfileVersion === '5.3':
-      return 'latest-6';
-    case lockfileVersion === '5.4':
-      return 'latest-7';
-    case lockfileVersion === '6.0' || lockfileVersion === '6.1':
-      return 'latest-8';
-    case lockfileVersion === '7.0' || lockfileVersion === '9.0':
-      return 'latest-9';
-    default:
-      return undefined;
-  }
-}
-
 export default runSelfInstaller