Change badge link for Python 3.13 tests

Updated badge for Python package tests to use Python 3.13.

Author: AxelHenningsson

README.rst

@@ -3,8 +3,8 @@
 .. image:: https://img.shields.io/pypi/pyversions/xrd-simulator.svg?
 	:target: https://pypi.org/project/xrd-simulator/
 
-.. image:: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/python-package-run-tests-linux-py38.yml/badge.svg?
-	:target: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/python-package-run-tests-linux-py38.yml
+.. image:: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/python-package-run-tests-linux-py313.yml/badge.svg?
+	:target: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/python-package-run-tests-linux-py313.yml/badge.svg
 
 .. image:: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/pages/pages-build-deployment/badge.svg?
 	:target: https://github.com/FABLE-3DXRD/xrd_simulator/actions/workflows/pages/pages-build-deployment/
@@ -295,4 +295,4 @@ Henningsson, A. & Hall, S. A. (2023). J. Appl. Cryst. 56, 282-292.*
 
 .. _can be found here.: https://github.com/conda-forge/xrd_simulator-feedstock
 
-.. _conda-forge channel: https://anaconda.org/conda-forge/xrd_simulator
+.. _conda-forge channel: https://anaconda.org/conda-forge/xrd_simulator