Solarize dependency graph during CI

         shortened = artifact.name[:-2]
         artifact.rename(testing_dir / shortened)
         subprocess.run(["gunzip", shortened], cwd=testing_dir)
+    with (testing_dir / "deps.svg").open() as fp:
+        deps_svg = fp.read()
+    deps_svg.replace("black", "#586e75").replace("white", "#002b36")
+    with (testing_dir / "deps.svg").open("w") as fp:
+        fp.write(deps_svg)
 
 
 def get_package_releases(project):