@Santanu ... Please see:
https://moodle.org/plugins/pluginversions.php?plugin=block_dedication
shows/claims compatibility with 3.x+ but download is for up to 3.2.
The maintainers names are at the above URL. Suggest contacting one of them to inquire.
Issues: https://bitbucket.org/ciceidev/moodle_block_dedication/issues
From the description think you could remove the block, do the upgrade, then wait for maintainers to provide an update ... reinstall.
'spirit of sharing', Ken