Bump pympipool from 0.8.0 to 0.8.4

Bumps [pympipool](https://github.com/pyiron/pympipool) from 0.8.0 to 0.8.4.
- [Release notes](https://github.com/pyiron/pympipool/releases)
- [Commits](pyiron/executorlib@pympipool-0.8.0...pympipool-0.8.4)

---
updated-dependencies:
- dependency-name: pympipool
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

pyproject.toml

@@ -42,7 +42,7 @@ dependencies = [
     "pyiron_base==0.8.3",
     "pyiron_contrib==0.1.16",
     "pyiron_snippets==0.1.0",
-    "pympipool==0.8.0",
+    "pympipool==0.8.4",
     "toposort==1.10",
     "typeguard==4.3.0",
 ]