Removing assert in the ServiceClientCore

[msmakouz]

This is a bug. responseClass is a class-string.

[codecov[bot]]

Codecov Report

Base: 91.68% // Head: 91.77% // Increases project coverage by +0.09% :tada:

Coverage data is based on head (9338418) compared to base (aed05ee). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.0 #59 +/- ## ============================================ + Coverage 91.68% 91.77% +0.09% Complexity 315 315 ============================================ Files 62 62 Lines 998 997 -1 ============================================ Hits 915 915 + Misses 83 82 -1 ``` | [Impacted Files](https://codecov.io/gh/spiral/roadrunner-bridge/pull/59?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spiral) | Coverage Δ | | |---|---|---| | [src/GRPC/Interceptor/ServiceClientCore.php](https://codecov.io/gh/spiral/roadrunner-bridge/pull/59/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spiral#diff-c3JjL0dSUEMvSW50ZXJjZXB0b3IvU2VydmljZUNsaWVudENvcmUucGhw) | `0.00% <ø> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spiral). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=spiral)

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