chore(deps): bump nltk from 3.5 to 3.6.5 (#53)

Bumps [nltk](https://github.com/nltk/nltk) from 3.5 to 3.6.5.
- [Release notes](https://github.com/nltk/nltk/releases)
- [Changelog](https://github.com/nltk/nltk/blob/develop/ChangeLog)
- [Commits](nltk/nltk@3.5...3.6.5)

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

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

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

Author: dependabot[bot]

requirements.txt

@@ -34,7 +34,7 @@ nbclient==0.5.1
 nbconvert==6.0.7
 nbformat==5.0.8
 nest-asyncio==1.4.3
-nltk==3.5
+nltk==3.6.5
 notebook==6.4.1
 numpy==1.19.5
 openpyxl==3.0.5