[Fix] Call operator __half explicit

[grimoire]

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Motivation

#2605

Modification

Call operator __half explicit in carafe_cuda_kernel.cuh

BC-breaking (Optional)

Does the modification introduce changes that break the backward-compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here, and update the documentation.

Checklist

Before PR:

• I have read and followed the workflow indicated in the CONTRIBUTING.md to create this PR.
• Pre-commit or linting tools indicated in CONTRIBUTING.md are used to fix the potential lint issues.
• Bug fixes are covered by unit tests, the case that causes the bug should be added in the unit tests.
• New functionalities are covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, including docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with some of those projects, like MMDet or MMCls.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

Base: 66.39% // Head: 66.39% // No change to project coverage 👍

Coverage data is based on head (a0afe65) compared to base (834f94d).
Patch has no changes to coverable lines.

❗ Current head a0afe65 differs from pull request most recent head 7b6a286. Consider uploading reports for the commit 7b6a286 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##              2.x    #2608   +/-   ##
=======================================
  Coverage   66.39%   66.39%           
=======================================
  Files         121      121           
  Lines        7971     7971           
  Branches     1100     1100           
=======================================
  Hits         5292     5292           
  Misses       2495     2495           
  Partials      184      184           

Flag	Coverage Δ
unittests	66.39% <ø> (ø)

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