fix: add missing closing response body

[alexandear]

Fix possible resource leaks by adding a statement that closes a response body.

Related Issue or Design Document

Checklist

• I have read the contributing guidelines and signed the CLA.
• I have referenced an issue containing the design document if my change introduces a new feature.
• I have read the security policy.
• I confirm that this pull request does not address a security vulnerability.
  If this pull request addresses a security vulnerability,
  I confirm that I got approval (please contact [email protected]) from the maintainers to push the changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added the necessary documentation within the code base (if appropriate).

Further comments

From the documentation:

The caller must close the response body when finished with it

Also, see this article for a deep dive into the problem.

[alnr]

This change is on branch v3.