rel(1.13.1): update changes [skip ci]

Author: mgxd

CHANGES.rst

@@ -1,3 +1,14 @@
+1.13.1 (May 02, 2025)
+=====================
+Patch release in the 1.13.x series.
+
+This release adds the ``niworkflows.engine.splicer`` module, to facilitate sugery on wworkflows.
+
+* FIX: Allow passing arguments through tag decorator (#939)
+* ENH: Workflow splicer module (#938)
+* MNT: Bump astral-sh/setup-uv from 5 to 6 (#937)
+
+
 1.13.0 (March 20, 2025)
 =======================
 New feature release in the 1.13.x series.