Fix swagger for pairing api

[sorru94]

Closes #907

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.47016% with 196 lines in your changes are missing coverage. Please review.

Project coverage is 68.35%. Comparing base (29ca119) to head (7d97daa). Report is 2 commits behind head on release-1.1.

:exclamation: Current head 7d97daa differs from pull request most recent head 13a834b. Consider uploading reports for the commit 13a834b to get more accurate results

Files	Patch %	Lines
...ib/astarte_data_updater_plant/data_updater/impl.ex	50.00%	31 Missing :warning:
...astarte_data_updater_plant/data_updater/queries.ex	41.30%	27 Missing :warning:
...management/lib/astarte_realm_management/queries.ex	84.39%	27 Missing :warning:
...e_housekeeping/lib/astarte_housekeeping/queries.ex	68.96%	18 Missing :warning:
...a_updater_plant/data_updater/deletion_scheduler.ex	15.78%	16 Missing :warning:
...gine/lib/astarte_trigger_engine/events_consumer.ex	0.00%	14 Missing :warning:
...tarte_realm_management/device_removal/scheduler.ex	23.07%	10 Missing :warning:
...eping_api/realms/device_registration_limit_type.ex	20.00%	8 Missing :warning:
...pps/astarte_pairing/lib/astarte_pairing/queries.ex	63.63%	8 Missing :warning:
...te_housekeeping/lib/astarte_housekeeping/engine.ex	84.44%	7 Missing :warning:
... and 15 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release-1.1 #908 +/- ## =============================================== - Coverage 71.61% 68.35% -3.27% =============================================== Files 195 274 +79 Lines 3319 7069 +3750 =============================================== + Hits 2377 4832 +2455 - Misses 942 2237 +1295 ```

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