remove synchronized blocks

[pjfanning]

Project Loom Virtual Thread users want us to remove synchronized blocks.

Woodstox has a few.

https://github.com/search?q=repo%3AFasterXML%2Fwoodstox%20synchronized&type=code

[cowtowncoder]

I am open to improvements like you did for Jackson.

[norrisjeremy]

FYI, JEP 491 should make wholesale conversions away from synchronized unnecessary.