fix(fastapi): do not use deprecated import path (#10652)

Current code generates warning:
ddtrace.DDTraceDeprecationWarning:
ddtrace.contrib.asgi.middleware.__path__ is deprecated

## Checklist
- [X] PR author has checked that all the criteria below are met
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- The PR description articulates the motivation for the change
- The change includes tests OR the PR description describes a testing
strategy
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- The change follows the [library release note
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- The change includes or references documentation updates if necessary
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[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist
- [x] Reviewer has checked that all the criteria below are met 
- Title is accurate
- All changes are related to the pull request's stated goal
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[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes
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[release branch maintenance
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Co-authored-by: erikayasuda <[email protected]>

ddtrace/contrib/internal/fastapi/patch.py

@@ -8,7 +8,7 @@
 from ddtrace import Pin
 from ddtrace import config
 from ddtrace.appsec._iast._utils import _is_iast_enabled
-from ddtrace.contrib.asgi.middleware import TraceMiddleware
+from ddtrace.contrib.internal.asgi.middleware import TraceMiddleware
 from ddtrace.contrib.internal.starlette.patch import _trace_background_tasks
 from ddtrace.contrib.internal.starlette.patch import traced_handler
 from ddtrace.internal.logger import get_logger

releasenotes/notes/fix-warning-import-54de769abd54f7b6.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Updates import path in FastAPI module to use the new ASGI module location.