chore(version): bump version to 2.3.1-dev

[ebaron]

Welcome to Cryostat! 👋

Before contributing, make sure you have:

• Read the contributing guidelines
• Linked a relevant issue which this PR resolves
• Linked any other relevant issues, PR's, or documentation, if any
• Resolved all conflicts, if any
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---

Related to: https://github.com/cryostatio/cryostat/issues/1459

[github-actions]

Test image available:

CRYOSTAT_IMAGE=ghcr.io/cryostatio/cryostat-web:pr-1040-2371b196edd064e8f7f6d9be0d6157cdb34869fc sh smoketest.sh

[tthvo]

We probably also want to update package.json. Just for completeness^^

// package.json
{
  "version": "2.3.1-dev"
}

[ebaron]

We probably also want to update package.json. Just for completeness^^

// package.json
{
  "version": "2.3.1-dev"
}

Thanks for pointing that out @tthvo. I've done that and added a note to our process guide.

[github-actions]

Test image available:

CRYOSTAT_IMAGE=ghcr.io/cryostatio/cryostat-web:pr-1040-08b093fba0e694d96909b2024e61a85552534d51 sh smoketest.sh