[vala] Sync NEWS from 0.52

[Rico Tzschichholz <ricotz src gnome org>]

commit 9bd62d5d3958f86a94a8fa12f7c9c1508d33f595
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun May 2 09:11:39 2021 +0200

    Sync NEWS from 0.52

 NEWS | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
---
diff --git a/NEWS b/NEWS
index c63cc46ca..7ed6cd6e7 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,20 @@
+Vala 0.52.3
+===========
+ * Various improvements and bug fixes:
+  - codegen:
+    + Apply gconstpointer to gpointer cast to GenericType only
+    + Fix access to captured generics in async method of interfaces (2)
+    + Use if-clause for is_in_destructor() condition to be more clear
+    + Add missing "_return" label and "_inner_error*_" declaration in dtors
+    + Don't use G_GNUC_INTERNAL on implicit type specific fields
+  - vala:
+    + length-type of arrays must not be nullable
+    + Report a warning for unhandled errors in destructors
+  - parser:
+    + Minor semantic checks to improve error messages
+    + Allow empty member-initializer and accept trailing comma
+    + Include INTERR token in source_reference of parsed types
+
 Vala 0.52.2
 ===========
  * Regression and bug fixes: