Removed 2 unnecessary stubbings in TimeBasedCacheTest.java

[ARUS2023]

In our analysis of the project, we observed that: 2 stubbings are created but never executed by the test TimeBasedCacheTest.doesNotReloadCacheWithinTimeLimit.

Unnecessary stubbings are stubbed method calls that were never realized during test execution. Mockito recommends to remove unnecessary stubbings (https://www.javadoc.io/doc/org.mockito/mockito-core/latest/org/mockito/exceptions/misusing/UnnecessaryStubbingException.html).

We propose below a solution to remove the unnecessary stubbing.