Update 0008-exit-tests.md: update status to 'Implemented'

Author: maartene

proposals/testing/0008-exit-tests.md

@@ -3,7 +3,7 @@
 * Proposal: [ST-0008](https://github.com/swiftlang/swift-evolution/blob/main/proposals/testing/0008-exit-tests.md)
 * Authors: [Jonathan Grynspan](https://github.com/grynspan)
 * Review Manager: [Maarten Engels](https://github.com/maartene)
-* Status: **Accepted with Modifications**
+* Status: **Implemented (Swift 6.2)**
 * Bug: [apple/swift-testing#157](https://github.com/apple/swift-testing/issues/157)
 * Implementation: [apple/swift-testing#324](https://github.com/swiftlang/swift-testing/pull/324)
 * Previous Revision: [1](https://github.com/swiftlang/swift-evolution/blob/fdfc7867df4e35e29b2a24edee34ea4412ec15b0/proposals/testing/0008-exit-tests.md)