chore(*): add mathlib4 synchronization comments (#19174)
Regenerated from the [port status wiki page](https://github.com/leanprover-community/mathlib/wiki/mathlib4-port-status).
Relates to the following files:
* `algebra.lie.cartan_matrix`
* `algebra.module.zlattice`
* `analysis.complex.polynomial`
* `category_theory.monoidal.limits`
* `category_theory.preadditive.schur`
* `category_theory.sites.compatible_sheafification`
* `data.polynomial.unit_trinomial`
* `field_theory.is_alg_closed.classification`
* `field_theory.is_alg_closed.spectrum`
* `linear_algebra.eigenspace.is_alg_closed`
* `linear_algebra.matrix.charpoly.eigs`
* `measure_theory.measure.portmanteau`
