opentelemetry-api: allow importlib-metadata up to 8.0

[xrmx]

Description

Allow importlib-metadata 8.0.0 too

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Tested with the following patch applied:

diff --git a/opentelemetry-api/test-requirements.txt b/opentelemetry-api/test-requirements.txt
index 3c84695a..b7f263c8 100644
--- a/opentelemetry-api/test-requirements.txt
+++ b/opentelemetry-api/test-requirements.txt
@@ -1,7 +1,7 @@
 asgiref==3.7.2
 Deprecated==1.2.14
 flaky==3.7.0
-importlib-metadata==6.11.0
+importlib-metadata==8.0.0
 iniconfig==2.0.0
 packaging==24.0
 pluggy==1.5.0

• tox -e py310-test-opentelemetry-api

Does This PR Require a Contrib Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated