Fix crash when closing a connection during setup

Closes a race condition where disposing a connection before its internal
initialization completed could crash the program.

Updates courier to 0.1.4.

Author: SeanTAllen

.release-notes/fix-close-during-init.md

@@ -0,0 +1,3 @@
+## Fix crash when closing a connection during setup
+
+Closing or disposing a connection while it was still being set up (before internal initialization completed) could crash the program. This was a race condition that was unlikely but possible, particularly on arm64. Connections now handle early close safely.

corral.json

@@ -10,7 +10,7 @@
     },
     {
       "locator": "github.com/ponylang/courier.git",
-      "version": "0.1.2"
+      "version": "0.1.4"
     },
     {
       "locator": "github.com/ponylang/uri.git",