build(deps): bump testtools from 2.7.0 to 2.7.1

Bumps [testtools](https://github.com/testing-cabal/testtools) from 2.7.0 to 2.7.1.
- [Release notes](https://github.com/testing-cabal/testtools/releases)
- [Changelog](https://github.com/testing-cabal/testtools/blob/master/NEWS)
- [Commits](testing-cabal/testtools@2.7.0...2.7.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -80,7 +80,7 @@ requests-oauthlib==1.3.1
 rsa==4.9
 six==1.16.0
 soupsieve==2.5
-testtools==2.7.0
+testtools==2.7.1
 tlslite-ng==0.8.0a44
 tweepy==4.14.0
 ujson==5.8.0