[Snyk] Security upgrade heroku-bouncer from 0.8.0 to 0.8.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • Gemfile

⚠️ Warning

``` Failed to update the Gemfile.lock, please update manually before merging. ```

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	654/1000 Why? Has a fix available, CVSS 8.8	Cross-site Request Forgery (CSRF) SNYK-RUBY-OMNIAUTH-174820	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

---

Note: You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.

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📚 Read more about Snyk's upgrade and patch logic

[edmorley]

The dependency is already up to date: https://github.com/heroku/starboard/blob/bfc0d7ca01e24e77623b0f34696bd76b9094084b/Gemfile.lock#L37

Even Snyk knows this:

[Snyk] Security upgrade heroku-bouncer from 0.8.0 to 0.8.0