fix(github): fix GitHub Actions failing on build

[marcobuschini]

The webpack dependency was missing from package.json but present on the development disk. Should be fixed now.

[coveralls]

Pull Request Test Coverage Report for Build 1382432115

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 1382329991:	0.0%
Covered Lines:	4
Relevant Lines:	4

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💛 - Coveralls