build(docs-infra): update terser version in lockfile

[filipesilva]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

See angular/angular-cli#13582 (comment).

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[mary-poppins]

You can preview 0eecd2f at https://pr28512-0eecd2f.ngbuilds.io/.

[gkalpak]

I don't think this will be necessary after #28510 (but probably doesn't hurt either).

[gkalpak]

@filipesilva, can you please change the commit message to build(docs-infra): ...?

[filipesilva]

@gkalpak done.

[mary-poppins]

You can preview 122f9b3 at https://pr28512-122f9b3.ngbuilds.io/.

[gkalpak]

For future reference:
Actually, this is not necessary even without #28510 (since the lockfile is ignored in the affected builds), but still doesn't hurt either.

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