[Snyk] Security upgrade alpine from 3.7 to 3

[tf-security]

This PR was automatically created by Snyk using the credentials of a real user.


Snyk has created this PR to fix 1 vulnerabilities in the dockerfile dependencies of this project.

Keeping your Docker base image up-to-date means you’ll benefit from security fixes in the latest version of your chosen image.

Snyk changed the following file(s):

• Dockerfile

We recommend upgrading to alpine:3, as this image has only 1 known vulnerabilities. To do this, merge this pull request, then verify your application still works as expected.

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	714
	Out-of-bounds Write SNYK-ALPINE37-MUSL-458286	714

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Important

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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[bender-bot-tf]

The main codeowner in the CODEOWNERS file of this repository is not a valid Typeform team, it is critical for many metrics at Typeform to comply with this standard.
More info: https://www.notion.so/typeform/CODEOWNERS-679209781dfa486295279039d38ff225
If you have any doubts please contact #app-infra-team.