Avoid deprecated Bundler method all_specs

[jcoyne]

 [DEPRECATED] Bundler.rubygems.all_specs has been removed in favor of Bundler.rubygems.installed_specs

This is used in several places:
https://github.com/search?q=repo%3Anewrelic%2Fnewrelic-ruby-agent%20all_specs&type=code

[workato-integration]

https://new-relic.atlassian.net/browse/NR-285054

[hannahramadan]

Hi @jcoyne! Thank you for letting us know about this. We still support Bundler v1, which doesn’t have the new installed_specs method, so we won’t be able to switch the methods out. However, we will look into silencing this warning for newer Bundler users. For now, I’m going to remove the bug label for housekeeping purposes.

[gstokkink]

@hannahramadan can't you check whether installed_specs is present and call that instead of all_specs?

[hannahramadan]

Thank you again for sharing this issue with us @jcoyne! We are including a fix for this in our next release, 9.13.0, which should be available within the next week. cc @gstokkink

[gstokkink]

@hannahramadan thanks for the quick follow-up!

[hannahramadan]

Ruby agent 9.13.0 is live and includes this update.

Closed by: #2823