Update status of SE-0392 for second review

Author: jckarter

proposals/0392-custom-actor-executors.md

@@ -3,7 +3,7 @@
 - Proposal: [SE-0392](0392-custom-actor-executors.md)
 - Authors: [Konrad 'ktoso' Malawski](https://github.com/ktoso), [John McCall](https://github.com/rjmccall), [Kavon Farvardin](https://github.com/kavon)
 - Review Manager: [Joe Groff](https://github.com/jckarter)
-- Status: **Active review (March 8 ... March 21, 2023)**
+- Status: **Active review (April 7 ... April 17, 2023)**
 - Implementation: Partially implemented on `main`
 - Previous threads:
   - Original pitch thread from around Swift 5.5: [Support custom executors in Swift Concurrency](https://forums.swift.org/t/support-custom-executors-in-swift-concurrency/44425)