[Snyk] Security upgrade nginx from alpine to 1-alpine

[snyk-bot]

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

Changes included in this PR

• images/4.2/alpine/Dockerfile

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

Some of the most important vulnerabilities in your base image include:

Severity	Priority Score / 1000	Issue	Exploit Maturity
	571	Incorrect Default Permissions SNYK-ALPINE316-CURL-2938013	No Known Exploit
	571	Incorrect Default Permissions SNYK-ALPINE316-CURL-2938013	No Known Exploit
	371	Allocation of Resources Without Limits or Throttling SNYK-ALPINE316-CURL-2938014	No Known Exploit
	471	Inadequate Encryption Strength SNYK-ALPINE316-OPENSSL-2941806	No Known Exploit
	471	Inadequate Encryption Strength SNYK-ALPINE316-OPENSSL-2941806	No Known Exploit

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