Stage for v3.1.12.1

Signed-off-by: Larry Gritz <lg@larrygritz.com>

Author: lgritz

CHANGES.md

@@ -1,3 +1,9 @@
+Release 3.1.12.1 (Apr 23, 2026) -- compared to 3.1.12.0
+---------------------------------------------------------
+  - *fix*: Relax OpenColorIO exception handling [#5164](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5164)
+  - *ci*: Fix CI breakages from fmtlib renaming 'master' to 'main' [#5127](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5127) and missing jpeg-xl install on Mac [#5139](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5139)
+
+
 Release 3.1.12.0 (Apr 1, 2026) -- compared to 3.1.11.0
 ---------------------------------------------------------
   - *oiiotool*: Better type understanding with `-i:ch=` and other cleanup [#5056](https://github.com/AcademySoftwareFoundation/OpenImageIO/pull/5056)

CMakeLists.txt

@@ -4,7 +4,7 @@
 
 cmake_minimum_required (VERSION 3.18.2...4.0)
 
-set (OpenImageIO_VERSION "3.1.12.0")
+set (OpenImageIO_VERSION "3.1.12.1")
 set (OpenImageIO_VERSION_OVERRIDE "" CACHE STRING
      "Version override (use with caution)!")
 mark_as_advanced (OpenImageIO_VERSION_OVERRIDE)