Warnings banned

[shinnokdisengir]

Added --warnings-as-errors --force to compiler, no warnings are allowed

• astarte_appengine_api
• astarte_data_updater_plant
• astarte_housekeeping
• astarte_housekeeping_api
• astarte_pairing
• astarte_pairing_api
• astarte_realm_management
• astarte_trigger_engine

upgraded libraries:

• GetText -> 2.24
• Guardian -> 2.3.2

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 13.98964% with 332 lines in your changes are missing coverage. Please review.

Project coverage is 68.13%. Comparing base (fe5f35c) to head (f5887a6).

Files	Patch %	Lines
...e_housekeeping/lib/astarte_housekeeping/queries.ex	6.09%	77 Missing :warning:
...management/lib/astarte_realm_management/queries.ex	3.44%	56 Missing :warning:
...ib/astarte_data_updater_plant/data_updater/impl.ex	2.85%	34 Missing :warning:
...ne_api/lib/astarte_appengine_api/device/queries.ex	0.00%	27 Missing :warning:
...astarte_data_updater_plant/data_updater/queries.ex	4.00%	24 Missing :warning:
...pps/astarte_pairing/lib/astarte_pairing/queries.ex	23.52%	13 Missing :warning:
..._housekeeping/lib/astarte_housekeeping/migrator.ex	0.00%	12 Missing :warning:
..._management/lib/astarte_realm_management/engine.ex	29.41%	12 Missing :warning:
...ine_api/lib/astarte_appengine_api/device/device.ex	57.14%	9 Missing :warning:
...api/lib/astarte_appengine_api/rooms/amqp_client.ex	0.00%	6 Missing :warning:
... and 31 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #914 +/- ## ========================================== - Coverage 68.14% 68.13% -0.01% ========================================== Files 274 274 Lines 7191 7192 +1 ========================================== Hits 4900 4900 - Misses 2291 2292 +1 ```

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