Bump webpack-dev-server and @angular-devkit/build-angular in /butler_online/budgetbutler #528

Job	Run time
offline cargo fmt	9s
offline cargo test	56s
offline application-wrapper build	1m 23s
offline assembly	2m 31s
online api frontend lint	13s
online api cron build	2m 41s
offline application-wrapper lint	19s
online api cargo fmt	9s
online api build	2m 46s
online api frontend test	2m 46s
	13m 53s

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