update changelog and version

Author: HDembinski

doc/changelog.rst

@@ -5,6 +5,10 @@
 Changelog
 =========
 
+2.31.1rc0 (April 05, 2025)
+--------------------------
+- Fix ccache keys (`#1082 <https://github.com/scikit-hep/iminuit/pull/1082>`_)
+
 2.31.0 (April 04, 2025)
 -----------------------
 - Fix qt widget sizing issues and simplify code (`#1075 <https://github.com/scikit-hep/iminuit/pull/1075>`_)

pyproject.toml

@@ -5,7 +5,7 @@ build-backend = "scikit_build_core.build"
 [project]
 name = "iminuit"
 description = "Jupyter-friendly Python frontend for MINUIT2 in C++"
-version = "2.31.0"
+version = "2.31.1rc0"
 maintainers = [{ name = "Hans Dembinski", email = "hans.dembinski@gmail.com" }]
 readme = "README.rst"
 requires-python = ">=3.9"