Correct libraryExport to use configurableUri

Bug: https://github.com/dart-lang/sdk/issues/53214
Change-Id: Idb0756d0c666c8126f5bbb7247b0e40791f28e39
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/320560
Commit-Queue: Erik Ernst <eernst@google.com>
Auto-Submit: Erik Ernst <eernst@google.com>
Reviewed-by: William Hesse <whesse@google.com>

tools/spec_parser/Dart.g

@@ -4,6 +4,8 @@
 
 // CHANGES:
 //
+// v0.37 Correct `libraryExport` to use `configurableUri`, not `uri`.
+//
 // v0.36 Update syntax from `inline class` to `extension type`, including
 // a special case of primary constructors.
 //
@@ -1371,7 +1373,7 @@ libraryImport
     ;
 
 importSpecification
-    :    IMPORT configurableUri (DEFERRED? AS identifier)? combinator* ';'
+    :    IMPORT configurableUri (DEFERRED? AS typeIdentifier)? combinator* ';'
     ;
 
 combinator
@@ -1384,7 +1386,7 @@ identifierList
     ;
 
 libraryExport
-    :    metadata EXPORT uri combinator* ';'
+    :    metadata EXPORT configurableUri combinator* ';'
     ;
 
 partDirective