Update dependency node-sass to v6

1 job for renovate/node-sass-6.x in 3 minutes and 50 seconds (queued for 8 minutes and 31 seconds)
Name Stage Failure
build-docker Build
 @ ./src/main.ts
@ multi ./src/main.ts

ERROR Build failed with errors.
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.
The command '/bin/sh -c yarn run build' returned a non-zero code: 1
Cleaning up file based variables
ERROR: Job failed: exit code 1