Update dependency nltk to v3.4.5

[mend-for-github-com]

This PR contains the following updates:

Package	Update	Change
nltk (source)	minor	==3.2.1 -> ==3.8.1

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2019-14751	#6
High	7.5	CVE-2021-3828	#30
High	7.5	CVE-2021-3842	#32
High	7.5	CVE-2021-43854	#33
Medium	6.1	WS-2022-0437	#31
Medium	5.0	WS-2022-0438	#36

---

• If you want to rebase/retry this PR, click this checkbox. ⚠ Warning: custom changes will be lost.

[mend-for-github-com]

Edited/Blocked Notification

Renovate will not automatically rebase this PR, because it does not recognize the last commit author and assumes somebody else may have edited the PR.

You can manually request rebase by checking the rebase/retry box above.

⚠ Warning: custom changes will be lost.