Drop support for <3.13 (#1311)

Author: nikhilwoodruff

changelog_entry.yaml

@@ -0,0 +1,4 @@
+- bump: minor
+  changes:
+    fixed:
+    - Dropped support for <3.13.

pyproject.toml

@@ -1,6 +1,6 @@
 [project] 
 name = "policyengine-uk"
-version = "2.45.1"
+version = "2.45.4"
 description = "PolicyEngine tax and benefit system for the UK"
 readme = "README.md"
 authors = [
@@ -22,7 +22,7 @@ classifiers = [
     "Programming Language :: Python :: 3.13",
     "Topic :: Scientific/Engineering :: Information Analysis",
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.13"
 dependencies = [
     "policyengine-core>=3.19.3",
     "microdf-python>=1.0.2",