Remove workaround for old truffleruby version from 2021

Author: eregon

bundler.js

@@ -48,16 +48,6 @@ function readBundledWithFromGemfileLock(lockFile) {
   return null
 }
 
-async function afterLockFile(lockFile, platform, engine, rubyVersion) {
-  if (engine.startsWith('truffleruby') && common.floatVersion(rubyVersion) < 21.1 && platform.startsWith('ubuntu-')) {
-    const contents = fs.readFileSync(lockFile, 'utf8')
-    if (contents.includes('nokogiri')) {
-      await common.measure('Installing libxml2-dev libxslt-dev, required to install nokogiri on TruffleRuby < 21.1', async () =>
-        exec.exec('sudo', ['apt-get', '-yqq', 'install', 'libxml2-dev', 'libxslt-dev'], { silent: true }))
-    }
-  }
-}
-
 export async function installBundler(bundlerVersionInput, rubygemsInputSet, lockFile, platform, rubyPrefix, engine, rubyVersion) {
   let bundlerVersion = bundlerVersionInput
 
@@ -175,8 +165,6 @@ export async function bundleInstall(gemfile, lockFile, platform, engine, rubyVer
     await exec.exec('bundle', ['lock'], envOptions)
   }
 
-  await afterLockFile(lockFile, platform, engine, rubyVersion)
-
   // cache key
   const paths = [cachePath]
   const baseKey = await computeBaseKey(engine, rubyVersion, lockFile, cacheVersion)