atomicwrites is not needed to run tests.
see also https://github.com/repo-helper/dist-meta/issues/65

--- dist-meta-0.9.0/tests/requirements.txt.orig
+++ dist-meta-0.9.0/tests/requirements.txt
@@ -1,6 +1,5 @@
 # Attrs is required here as pytest no longer depends upon it
 apeye>=1.0.1
-atomicwrites>=1.4.1
 attrs>=22.2.0
 coincidence>=0.2.0
 colorama>=0.4.5