Check for npm error code 409 to skip previously published packages in private registries (#605)

* Use npm error code 409

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Michał Krassowski <5832902+krassowski@users.noreply.github.com>

Author: 3 people

jupyter_releaser/lib.py

@@ -450,7 +450,11 @@ def publish_assets(
                 util.run(f"{npm_cmd} {name}", cwd=dist_dir, quiet=True, quiet_error=True, echo=True)
             except CalledProcessError as e:
                 stderr = e.stderr
-                if "EPUBLISHCONFLICT" in stderr or "previously published versions" in stderr:
+                if (
+                    "E409" in stderr
+                    or "EPUBLISHCONFLICT" in stderr
+                    or "previously published versions" in stderr
+                ):
                     continue
                 util.log(stderr)
                 raise e