[Snyk] Security upgrade httparty from 0.16.1 to 0.21.0

[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:
  • ruby/example_consumer_spec/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
	718/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 6.5	External Control of Assumed-Immutable Web Parameter SNYK-RUBY-HTTPARTY-3188560	No	Proof of Concept

(*) 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.

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