set wasi:io package version to 0.2.0

Author: Pat Hickey

wit/error.wit

@@ -1,4 +1,4 @@
-package wasi:io@0.2.0-rc-2023-11-10;
+package wasi:io@0.2.0;
 
 
 interface error {

wit/poll.wit

@@ -1,4 +1,4 @@
-package wasi:io@0.2.0-rc-2023-11-10;
+package wasi:io@0.2.0;
 
 /// A poll API intended to let users wait for I/O events on multiple handles
 /// at once.

wit/streams.wit

@@ -1,4 +1,4 @@
-package wasi:io@0.2.0-rc-2023-11-10;
+package wasi:io@0.2.0;
 
 /// WASI I/O is an I/O abstraction API which is currently focused on providing
 /// stream types.

wit/world.wit

@@ -1,4 +1,4 @@
-package wasi:io@0.2.0-rc-2023-11-10;
+package wasi:io@0.2.0;
 
 world imports {
     import streams;