[audio] Increase threshold in unit tests to prevent intermittent failures

[anteju]

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What does this PR do ?

This PR increases absolute tolerance in a unit test to prevent intermittent failures.
In some CI runs we see tests failing because of differences a bit above 1e-5.

Collection: audio tests

Changelog

• Changed abs_tol = 1e-5 to abs_tol = 5e-5

Usage

N/A

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Additional Information

• Related to [Audio] fix a flaky test (and also make some tests run faster) #13439

[anteju]

The same fix applied in #13439.
Closing this PR since it's not necessary anymore.