Bump chgnet from 0.3.8 to 0.4.2

Bumps [chgnet](https://github.com/CederGroupHub/chgnet) from 0.3.8 to 0.4.2.
- [Release notes](https://github.com/CederGroupHub/chgnet/releases)
- [Commits](CederGroupHub/chgnet@v0.3.8...v0.4.2)

---
updated-dependencies:
- dependency-name: chgnet
  dependency-version: 0.4.2
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -104,7 +104,7 @@ strict-openff = [
 strict-forcefields = [
     "calorine==3.2; python_version >= '3.12'",
     "calorine==3.1; python_version < '3.12'",
-    "chgnet==0.3.8",
+    "chgnet==0.4.2",
     "mace-torch==0.3.14",
     "matgl==1.3.0",
     "quippy-ase==0.9.14; python_version < '3.12'",