[Snyk] Security upgrade alpine from latest to 3.18.3

[DonRichards]

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

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 - snapshot/Dockerfile We recommend upgrading to `alpine:3.18.3`, as this image has only 0 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 | Issue | Exploit Maturity | | :------: | :---- | :--------------- | |  | Improper Authentication
[SNYK-ALPINE318-OPENSSL-5776808](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-5776808) | No Known Exploit | |  | Improper Authentication
[SNYK-ALPINE318-OPENSSL-5776808](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-5776808) | No Known Exploit | |  | Inefficient Regular Expression Complexity
[SNYK-ALPINE318-OPENSSL-5788370](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-5788370) | No Known Exploit | |  | Inefficient Regular Expression Complexity
[SNYK-ALPINE318-OPENSSL-5788370](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-5788370) | No Known Exploit | |  | CVE-2023-3817
[SNYK-ALPINE318-OPENSSL-5821142](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-5821142) | No Known Exploit | --- **Note:** _You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs._ For more information: 🧐 [View latest project report](https://app.snyk.io/org/donrichards/project/7c1a1d78-a7f4-4753-8b00-8a24c5a235c7?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/donrichards/project/7c1a1d78-a7f4-4753-8b00-8a24c5a235c7?utm_source=github&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"b8b9c578-9fa8-435e-969c-913fd1d44ee0","prPublicId":"b8b9c578-9fa8-435e-969c-913fd1d44ee0","dependencies":[{"name":"alpine","from":"latest","to":"3.18.3"}],"packageManager":"dockerfile","projectPublicId":"7c1a1d78-a7f4-4753-8b00-8a24c5a235c7","projectUrl":"https://app.snyk.io/org/donrichards/project/7c1a1d78-a7f4-4753-8b00-8a24c5a235c7?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-ALPINE318-OPENSSL-5788370","SNYK-ALPINE318-OPENSSL-5776808","SNYK-ALPINE318-OPENSSL-5821142"],"upgrade":["SNYK-ALPINE318-OPENSSL-5776808","SNYK-ALPINE318-OPENSSL-5776808","SNYK-ALPINE318-OPENSSL-5788370","SNYK-ALPINE318-OPENSSL-5788370","SNYK-ALPINE318-OPENSSL-5821142"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title"],"priorityScoreList":[null,null,null],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Inefficient Regular Expression Complexity](https://learn.snyk.io/lesson/redos/?loc=fix-pr)

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