Update NonBlockingThreadPool.h plain asserts to use eigen_plain_assert

Sophie Changrequested to merge
sophiechang/eigen:master into master

Reference issue

Fixes #2850 (closed)

What does this implement/fix?

Update NonBlockingThreadPool.h plain asserts to use eigen_plain_assert. This allows for continued compatibility with projects that are not on cxx26 yet

Additional information

N/A

Edited by Charles Schlosser

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