bolt-ktor: upgrade ktor to v3 + bump to 1.46.0-SNAPSHOT

[SkyfallWasTaken]

Closes #1480.

Category (place an x in each of the [ ])

• [ ] bolt (Bolt for Java)
• [x] bolt-ktor (Bolt for Java - optional modules)
• [ ] slack-api-client (Slack API Clients)
• [ ] slack-api-model (Slack API Data Models)
• [ ] slack-api-*-kotlin-extension (Kotlin Extensions for Slack API Clients)
• [ ] slack-app-backend (The primitive layer of Bolt for Java)

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