Update Tabulator to v5.1.8

see Tabulator release notes since v5.1.0 we are currently using:

https://github.com/olifolkerd/tabulator/releases

will need to update tabulator view imports in our config after testing those release changes: 

https://github.com/RandomFractals/tabular-data-viewer/blob/main/src/configuration/configuration.ts#L32