Release v0.5.0

What's Changed

• Bump tough-cookie from 4.1.2 to 4.1.3 in /js by @dependabot in #218
• Bump semver from 5.7.1 to 5.7.2 in /js by @dependabot in #219
• Support JupyterLab 4 by @timkpaine in #220
• Bump version: 0.4.1 → 0.5.0 by @timkpaine in #222

Full Changelog: v0.4.1...v0.5.0