Log Message:
texlab: update to 4.2.1.

[4.2.1] - 05.08.2022

Fixed

    Deserialize server options with missing keys (or not keys at all) correctly \ 
(#707)
    Pass chktexrc files if they are not in the current directory (#683)
    Revert back to server-side file watching due to lack of client support (#679)