build(deps): bump soupsieve from 2.5 to 2.6

Bumps [soupsieve](https://github.com/facelessuser/soupsieve) from 2.5 to 2.6.
- [Release notes](https://github.com/facelessuser/soupsieve/releases)
- [Commits](https://github.com/facelessuser/soupsieve/compare/2.5...2.6)

---
updated-dependencies:
- dependency-name: soupsieve
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -97,7 +97,7 @@ rsa==4.9
 sgmllib3k==1.0.0
 simple-websocket==1.0.0
 six==1.16.0
-soupsieve==2.5
+soupsieve==2.6
 testtools==2.7.2
 tlslite-ng==0.7.6
 tweepy==4.14.0