chore(deps): bump plug from 1.18.1 to 1.19.1 in the prod group (#395)

Bumps the prod group with 1 update: [plug](https://github.com/elixir-plug/plug).


Updates `plug` from 1.18.1 to 1.19.1
- [Changelog](https://github.com/elixir-plug/plug/blob/main/CHANGELOG.md)
- [Commits](elixir-plug/plug@v1.18.1...v1.19.1)

---
updated-dependencies:
- dependency-name: plug
  dependency-version: 1.19.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: prod
...

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Author: dependabot[bot]