[BUG] notify restart airflow services not found when installing DAG dependencies

[ultraheroe]

Description

When a DAG dependence is set on dags_dependencies after installing it the task notify to an unknown (typo) restart handler
Handler is e.g: "restart airflow-webserver" and the task has "restart airflow_webserver"

Steps to Reproduce

1. Declare a DAG package dependence
2. Go for the run

Expected behavior:
Handler restart the services normally

Actual behavior:
Handler misses the restart of the services because of a typo

Reproduces how often:
When a DAG dependence is set

Environment

• The release version/s you are using:
• OS: Debian 10
• airflow-role: 2.0.0 and 2.0.1