Fix typo in forward_compatible_horizon function signature
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**Pull Request Summary:**

This pull request updates the forward compatibility date in the `forward_compatibility_horizon` function to fix a small typo in the function signature. The parameter name `date` has been corrected to `day` for consistency.

**Changes Made:**
- Updated the function signature in `forward_compatibility_horizon` from `forward_compatible(year=2018, month=08, date=01)` to `forward_compatible(year=2018, month=08, day=01)`.

This change is cosmetic and does not alter the functionality of the code. It enhances code readability by aligning the parameter name with its usage within the function.

**Context:**
The adjustment aims to maintain a uniform and intuitive coding style. Consistent parameter naming conventions contribute to a more understandable codebase and facilitate collaboration among contributors. This modification has no impact on the behavior of the code but promotes better code comprehension.



```diff
- if compat.forward_compatible(year=2018, month=08, date=01):
+ if compat.forward_compatible(year=2018, month=08, day=01):
