Remove unused dependencies

[mjpieters]

The @octokit/plugin- references are not actually (directly) used by
@action/github-script and so only serve to confuse about what exact
version of these is included in the action. The actual versions of
these plugins are set by @action/github.

Ignoring newlines, the dist/index.js file is exactly the same without
listing these dependencies in package.json.

[mjpieters]

In case someone wanted to debug the Octokit versions as I had to, the following snippet will do so in debug mode:

core.startGroup('Octokit versions:')
core.debug(`Core: ${github.constructor.VERSION}`)
for (const plugin of github.constructor.plugins)
  core.debug(`plugin ${plugin.name}: ${plugin.VERSION}`)
core.endGroup()

[joshmgross]

Is there any way for users to reference these dependencies in their script blocks?

I'm guessing no if we're not passing them as arguments, just want to ensure we don't break someone here.

[mjpieters]

Is there any way for users to reference these dependencies in their script blocks?

No, because they were never included with the action bundle, so you couldn't even import them with __original_require__. Note that the dist/index.js file is unchanged! :-)

[mjpieters]

To be explicit: those dependencies are included in the action bundle, but not as the versions that were named in package.json. The bundler rightly includes the versions that are actually in use, so the versions that actions/github sets, @octokit/plugin-paginate-rest 2.17.0 and @octokit/plugin-rest-endpoint-methods 5.16.2.