[Snyk] Security upgrade python from 3.7-slim to 3.8.18-slim

[nr-security-github]

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 - Dockerfile We recommend upgrading to `python:3.8.18-slim`, as this image has only 35 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 | | :------: | :-------------------- | :---- | :--------------- | |  | **686** | Out-of-bounds Write
[SNYK-DEBIAN12-GLIBC-5927132](https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-5927132) | No Known Exploit | |  | **686** | Out-of-bounds Write
[SNYK-DEBIAN12-GLIBC-5927132](https://snyk.io/vuln/SNYK-DEBIAN12-GLIBC-5927132) | No Known Exploit | |  | **514** | Improper Authentication
[SNYK-DEBIAN12-OPENSSL-5776700](https://snyk.io/vuln/SNYK-DEBIAN12-OPENSSL-5776700) | No Known Exploit | |  | **514** | Inefficient Regular Expression Complexity
[SNYK-DEBIAN12-OPENSSL-5788322](https://snyk.io/vuln/SNYK-DEBIAN12-OPENSSL-5788322) | No Known Exploit | |  | **514** | Excessive Iteration
[SNYK-DEBIAN12-OPENSSL-5812633](https://snyk.io/vuln/SNYK-DEBIAN12-OPENSSL-5812633) | 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/newrelic/project/da2f00a3-462c-4656-b82f-47f19dfac47e?utm_source=github-enterprise&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/newrelic/project/da2f00a3-462c-4656-b82f-47f19dfac47e?utm_source=github-enterprise&utm_medium=referral&page=fix-pr/settings) [//]: # 'snyk:metadata:{"prId":"5277e2ac-4941-4011-bf1e-73bf66cc1766","prPublicId":"5277e2ac-4941-4011-bf1e-73bf66cc1766","dependencies":[{"name":"python","from":"3.7-slim","to":"3.8.18-slim"}],"packageManager":"dockerfile","projectPublicId":"da2f00a3-462c-4656-b82f-47f19dfac47e","projectUrl":"https://app.snyk.io/org/newrelic/project/da2f00a3-462c-4656-b82f-47f19dfac47e?utm_source=github-enterprise&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-DEBIAN12-GLIBC-5927132","SNYK-DEBIAN12-OPENSSL-5776700","SNYK-DEBIAN12-OPENSSL-5788322","SNYK-DEBIAN12-OPENSSL-5812633"],"upgrade":["SNYK-DEBIAN12-GLIBC-5927132","SNYK-DEBIAN12-GLIBC-5927132","SNYK-DEBIAN12-OPENSSL-5776700","SNYK-DEBIAN12-OPENSSL-5788322","SNYK-DEBIAN12-OPENSSL-5812633"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[686,514,514,514],"remediationStrategy":"vuln"}' --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Inefficient Regular Expression Complexity](https://learn.snyk.io/lesson/redos/?loc=fix-pr)

[codecov[bot]]

Codecov Report

Merging #247 (fc1dc67) into main (3732e00) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #247   +/-   ##
=======================================
  Coverage   78.39%   78.39%           
=======================================
  Files          16       16           
  Lines        1236     1236           
=======================================
  Hits          969      969           
  Misses        267      267           

:mega: We’re building smart automated test selection to slash your CI/CD build times. Learn more