net-im/teams: Update to 2.7.5

While here, add target for unit testing.

Changelog:

• https://github.com/IsmaelMartinez/teams-for-linux/releases/tag/v2.7.3
• https://github.com/IsmaelMartinez/teams-for-linux/releases/tag/v2.7.4
• https://github.com/IsmaelMartinez/teams-for-linux/releases/tag/v2.7.5

Reported by: portscout