fix: division by zero in language stats

[Zarthus]

Should fix #2160 (have not tested this particular change as I did not have a matching data set to reproduce)

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[backstage-goalie]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage-community/plugin-copilot	workspaces/copilot/plugins/copilot	patch	v0.3.0

[vinzscam]

@yoramshai any chance you could see whether these changes fix your issue?
cc @esw-afabiano

[yoramshai]

@vinzscam will try and update

[yoramshai]

@vinzscam It doesn't look like the issue has been completely solved after updating the above package.

[Zarthus]

@yoramshai 'completely'? does that mean you are experiencing partially improved behaviour or that it still gives the same issue as in the bug report?

[yoramshai]

What I'm seeing is one of the lang has too high percentage (e.g. > 500%)
Also I found out that I'm able to reproduce the infinity when I'm playing around with the dates (didn't find any pattern yet)

[Zarthus]

I'll check back once I'm back at work so I have a proper dataset to work with (would be new years), but yeah - that can't be intended. It'd be interesting to know what the GitHub API's response is to that Dockerfile analysis but I imagine I'd be able to figure out a reproduction case once I sit down with the project proper.