fix: pin importlib to 6.5.0 [backport 2.5] (#8196)

Backport c8d5e9f from #8075 to 2.5.

## Description

- Pin importlib to 6.5.0 to avoid issue
python/importlib_metadata#455
- Fix a potential unbound local error.

Fixes #8068 

## Checklist

- [X] Change(s) are motivated and described in the PR description.
- [X] Testing strategy is described if automated tests are not included
in the PR.
- [X] Risk is outlined (performance impact, potential for breakage,
maintainability, etc).
- [X] Change is maintainable (easy to change, telemetry, documentation).
- [X] [Library release note
guidelines](https://ddtrace.readthedocs.io/en/stable/releasenotes.html)
are followed. If no release note is required, add label
`changelog/no-changelog`.
- [X] Documentation is included (in-code, generated user docs, [public
corp docs](https://github.com/DataDog/documentation/)).
- [X] Backport labels are set (if
[applicable](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting))

## Reviewer Checklist

- [x] Title is accurate.
- [x] No unnecessary changes are introduced.
- [x] Description motivates each change.
- [x] Avoids breaking
[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
changes unless absolutely necessary.
- [x] Testing strategy adequately addresses listed risk(s).
- [x] Change is maintainable (easy to change, telemetry, documentation).
- [x] Release note makes sense to a user of the library.
- [x] Reviewer has explicitly acknowledged and discussed the performance
implications of this PR as reported in the benchmarks PR comment.
- [x] Backport labels are set in a manner that is consistent with the
[release branch maintenance
policy](https://ddtrace.readthedocs.io/en/latest/contributing.html#backporting)
- [x] If this PR touches code that signs or publishes builds or
packages, or handles credentials of any kind, I've requested a review
from `@DataDog/security-design-and-guidance`.
- [x] This PR doesn't touch any of that.

Co-authored-by: Juanjo Alvarez Martinez <[email protected]>

Author: github-actions[bot]

pyproject.toml

@@ -28,7 +28,7 @@ dependencies = [
     "cattrs",
     "ddsketch>=2.0.1",
     "envier",
-    "importlib_metadata; python_version<'3.8'",
+    "importlib_metadata<=6.5.0; python_version<'3.8'",
     "opentelemetry-api>=1",
     "protobuf>=3",
     "setuptools; python_version>='3.12'",

releasenotes/notes/pin-importlib-to-6.5.0-to-avoid-importlib-issue-455-d098894f7a29591b.yaml

@@ -0,0 +1,3 @@
+fixes:
+  - |
+    Pin importlib_metadata to 6.5.0 to avoid its issue 455 (https://github.com/python/importlib_metadata/issues/455).

setup.py

@@ -577,7 +577,7 @@ def get_ddup_ext():
         "cattrs",
         "six>=1.12.0",
         "typing_extensions",
-        "importlib_metadata; python_version<'3.8'",
+        "importlib_metadata<=6.5.0; python_version<'3.8'",
         "xmltodict>=0.12",
         "envier",
         "opentelemetry-api>=1",