bump nunjucks to 3.2.4

[itsyme]

What is the purpose of this pull request?

• Documentation update
• Bug fix
• Feature addition or enhancement
• Code maintenance
• DevOps
• Improve developer experience
• Others, please explain:

Overview of changes:
Resolves #2409. Bumped nunjucks from 3.2.2 to 3.2.4. There are no breaking changes in 3.2.3 and 3.2.4, with changes mostly being addition of small features and bugfixes. Key change is the fixing of prototype pollution vulnerability in 3.2.3.

Anything you'd like to highlight/discuss:

Testing instructions:

Proposed commit message: (wrap lines at 72 characters)

chore: bump nunjucks to 3.2.4

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Checklist: ☑️

• Updated the documentation for feature additions and enhancements
• Added tests for bug fixes or features
• Linked all related issues
• No unrelated changes

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Reviewer checklist:

Indicate the SEMVER impact of the PR:

• Major (when you make incompatible API changes)
• Minor (when you add functionality in a backward compatible manner)
• Patch (when you make backward compatible bug fixes)

At the end of the review, please label the PR with the appropriate label: r.Major, r.Minor, r.Patch.

Breaking change release note preparation (if applicable):

• To be included in the release note for any feature that is made obsolete/breaking

Give a brief explanation note about:

• what was the old feature that was made obsolete
• any replacement feature (if any), and
• how the author should modify his website to migrate from the old feature to the replacement feature (if possible).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (a265c73) 48.87% compared to head (14923f5) 48.87%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2411   +/-   ##
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  Coverage   48.87%   48.87%           
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  Files         124      124           
  Lines        5238     5238           
  Branches     1109     1109           
=======================================
  Hits         2560     2560           
  Misses       2371     2371           
  Partials      307      307           

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[yucheng11122017]

Hi @itsyme could you include a commit message? :)

[yucheng11122017]

LGTM! Thanks :)