Bump chgnet from 0.3.8 to 0.4.0

Bumps [chgnet](https://github.com/CederGroupHub/chgnet) from 0.3.8 to 0.4.0.
- [Release notes](https://github.com/CederGroupHub/chgnet/releases)
- [Commits](CederGroupHub/chgnet@v0.3.8...v0.4.0)

---
updated-dependencies:
- dependency-name: chgnet
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

pyproject.toml

@@ -117,7 +117,7 @@ strict = [
 ]
 strict-forcefields = [
     "calorine==2.2.1",
-    "chgnet==0.3.8",
+    "chgnet==0.4.0",
     "mace-torch>=0.3.3",
     "matgl==1.1.3",
     "quippy-ase==0.9.14; python_version < '3.12'",