Bump nltk from 3.6.2 to 3.6.5

Bumps [nltk](https://github.com/nltk/nltk) from 3.6.2 to 3.6.5.
- [Release notes](https://github.com/nltk/nltk/releases)
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.6.2...3.6.5)

---
updated-dependencies:
- dependency-name: nltk
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -27,7 +27,7 @@ matplotlib==3.4.3
 mccabe==0.6.1
 mypy-extensions==0.4.3
 nlpaug==1.1.7
-nltk==3.6.2
+nltk==3.6.5
 numba==0.53.1
 numpy==1.19.5
 packaging==21.0