Upgrade to 0.5.2

[coatless]

Need to bump the built-in webR version to 0.5.2

Notes:

• webR 0.5.0 was released ~3 weeks back with R 4.5.0
• webR 0.5.1 was released ~1 week back with R 4.5.1
• webR 0.5.2 has a minor docker change.