Set flags for coveralls actions

[offtherailz]

Description

• Due to the incidend happened on Aug 13th

This is the official communication

https://status.coveralls.io/incidents/v5mcbrsbhgt4

Reporting here their suggestion I agree

To avoid coveralls possible outages to block the build. It should be maybe updated to use @v2 instead of @master.

Here the doc.

https://github.com/marketplace/actions/coveralls-github-action#inputs

What kind of improvement you want to add? (check one with "x", remove the others)

• Minor changes to existing features
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Other... Please describe:

Other useful information