chore: set engine version to v3.23.0 (#1649)

## Checklist

- [x] I have read the [contribution
guidelines](https://github.com/ooni/probe-cli/blob/master/CONTRIBUTING.md)
- [x] reference issue for this pull request:
ooni/probe#2783
- [ ] if you changed anything related to how experiments work and you
need to reflect these changes in the ooni/spec repository, please link
to the related ooni/spec pull request: <!-- add URL here -->
- [ ] if you changed code inside an experiment, make sure you bump its
version number

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## Description

This diff sets the engine version to the latest `3.23.0` version in the
`release/3.23` branch

internal/version/version.go

@@ -2,4 +2,4 @@
 package version
 
 // Version is the ooniprobe version.
-const Version = "3.23.0-alpha"
+const Version = "3.23.0"