chore: remove unused parameter handlers (#10640)

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If I'm not wrong, the parameter `handlers` seems to be useless here since it hasn't been called in the whole project.
## Description

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Remove useless parameter `handlers`
## Related Issues

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  Link to the issue that is fixed by this PR (if there is one)
  e.g. Fixes #1234, Addresses #1234, Related to #1234, etc.
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packages/gatsby-cli/src/create-cli.js

@@ -271,7 +271,7 @@ function isLocalGatsbySite() {
   return inGatsbySite
 }
 
-module.exports = (argv, handlers) => {
+module.exports = argv => {
   let cli = yargs()
   let isLocalSite = isLocalGatsbySite()