Drop support for old pytests and now eol python 3.8. Apply ruff linting.

.cookiecutterrc

@@ -1,9 +1,6 @@
 # Generated by cookiepatcher, a small shim around cookiecutter (pip install cookiepatcher)
 
 default_context:
-    allow_tests_inside_package: 'no'
-    c_extension_function: '-'
-    c_extension_module: '-'
     c_extension_optional: 'no'
     c_extension_support: 'no'
     codacy: 'no'
@@ -17,10 +14,12 @@ default_context:
     email: [email protected]
     formatter_quote_style: single
     full_name: Ionel Cristian Mărieș
+    function_name: compute
     github_actions: 'yes'
     github_actions_osx: 'yes'
     github_actions_windows: 'yes'
     license: BSD 2-Clause License
+    module_name: core
     package_name: pytest_benchmark
     pre_commit: 'yes'
     project_name: pytest-benchmark
@@ -38,8 +37,9 @@ default_context:
     sphinx_docs: 'yes'
     sphinx_docs_hosting: https://pytest-benchmark.readthedocs.io/
     sphinx_doctest: 'no'
-    sphinx_theme: sphinx-py3doc-enhanced-theme
+    sphinx_theme: furo
     test_matrix_separate_coverage: 'yes'
+    tests_inside_package: 'no'
     version: 4.0.0
     version_manager: bump2version
     website: http://blog.ionelmc.ro