[Snyk] Security upgrade alpine from 3.18.3 to 3.18.6

[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:3.18.6`, 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 | Priority Score / 1000 | Issue | Exploit Maturity | | :------: | :-------------------- | :---- | :--------------- | |  | **614** | CVE-2023-5363
[SNYK-ALPINE318-OPENSSL-6032386](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6032386) | No Known Exploit | |  | **614** | CVE-2023-5363
[SNYK-ALPINE318-OPENSSL-6032386](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6032386) | No Known Exploit | |  | **514** | Improper Check for Unusual or Exceptional Conditions
[SNYK-ALPINE318-OPENSSL-6055795](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6055795) | No Known Exploit | |  | **586** | Out-of-bounds Write
[SNYK-ALPINE318-OPENSSL-6152404](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6152404) | No Known Exploit | |  | **586** | Out-of-bounds Write
[SNYK-ALPINE318-OPENSSL-6152404](https://snyk.io/vuln/SNYK-ALPINE318-OPENSSL-6152404) | 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":"61e3d8bf-92da-4a17-b3ff-24dea2074d47","prPublicId":"61e3d8bf-92da-4a17-b3ff-24dea2074d47","dependencies":[{"name":"alpine","from":"3.18.3","to":"3.18.6"}],"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-6032386","SNYK-ALPINE318-OPENSSL-6152404","SNYK-ALPINE318-OPENSSL-6055795"],"upgrade":["SNYK-ALPINE318-OPENSSL-6032386","SNYK-ALPINE318-OPENSSL-6032386","SNYK-ALPINE318-OPENSSL-6055795","SNYK-ALPINE318-OPENSSL-6152404","SNYK-ALPINE318-OPENSSL-6152404"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[614,586,514],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io/?loc=fix-pr)

[ghost]

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