Bump testtools from 2.8.1 to 2.8.2 (#32)

Bumps [testtools](https://github.com/testing-cabal/testtools) from 2.8.1 to 2.8.2.
- [Release notes](https://github.com/testing-cabal/testtools/releases)
- [Changelog](https://github.com/testing-cabal/testtools/blob/master/NEWS)
- [Commits](testing-cabal/testtools@2.8.1...2.8.2)

---
updated-dependencies:
- dependency-name: testtools
  dependency-version: 2.8.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-dev.txt

@@ -5,4 +5,4 @@ pycodestyle==2.14.0
 pyflakes==3.4.0
 requests-mock==1.12.1
 six==1.17.0
-testtools==2.8.1
+testtools==2.8.2