Bump captcha from 0.6.0 to 0.7.1 (#383)

Bumps [captcha](https://github.com/lepture/captcha) from 0.6.0 to 0.7.1.
- [Release notes](https://github.com/lepture/captcha/releases)
- [Changelog](https://github.com/lepture/captcha/blob/main/docs/changelog.rst)
- [Commits](https://github.com/lepture/captcha/compare/v0.6.0...v0.7.1)

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

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

requirements.txt

@@ -6,7 +6,7 @@ redis==5.2.1
 apscheduler==3.11.0
 pymongo==4.12.0
 tornado==6.4.2
-captcha==0.6.0
+captcha==0.7.1
 passlib==1.7.4
 fakeredis==2.28.1
 filetype==1.2.0