docs: add news item and link release notes for 12.0.3

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/docs/relnotes.html b/docs/relnotes.html
index 36600fc..c704d9e 100644
--- a/docs/relnotes.html
+++ b/docs/relnotes.html
@@ -21,6 +21,7 @@
 </p>
 
 <ul>
+<li><a href="relnotes/12.0.3.html">12.0.3 release notes</a>
 <li><a href="relnotes/12.0.2.html">12.0.2 release notes</a>
 <li><a href="relnotes/12.0.1.html">12.0.1 release notes</a>
 <li><a href="relnotes/12.0.0.html">12.0.0 release notes</a>