build(deps): bump nltk from 3.6.5 to 3.6.7

Bumps [nltk](https://github.com/nltk/nltk) from 3.6.5 to 3.6.7.
- [Release notes](https://github.com/nltk/nltk/releases)
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.6.5...3.6.7)

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

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

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ isodate == 0.6.0
 lxml == 4.7.1
 mcstatus == 6.5.0
 multidict == 5.2.0
-nltk == 3.6.5
+nltk == 3.6.6
 psutil == 5.8.0
 py-irclib == 0.3.0
 requests == 2.26.0