Update periodictable requirement from ~=1.7 to ~=2.0 in /pydatalab

Updates the requirements on [periodictable](https://github.com/python-periodictable/periodictable) to permit the latest version.
- [Release notes](https://github.com/python-periodictable/periodictable/releases)
- [Changelog](https://github.com/python-periodictable/periodictable/blob/master/ChangeLog.rst)
- [Commits](python-periodictable/periodictable@v1.7.0...v2.0.2)

---
updated-dependencies:
- dependency-name: periodictable
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pydatalab/pyproject.toml

@@ -22,7 +22,7 @@ requires-python = ">= 3.10, < 3.12"
 dependencies = [
     "bokeh ~= 2.4, < 3.0",
     "matplotlib ~= 3.8",
-    "periodictable ~= 1.7",
+    "periodictable ~= 2.0",
     "pydantic[email, dotenv] < 2.0",
     "pint ~= 0.24",
     "pandas[excel] ~= 2.2",