[SEMANTIC CONVENTIONS] Upgrade semantic conventions to 1.31.0

[marcalff]

Fixes #3294

Changes

Please provide a brief description of the changes here.

• Upgrade to semantic conventions 1.31.0
• Upgrade to weaver 0.13.2
• Use flag stable_only during weaver code generation.

For significant contributions please make sure you have completed the following items:

• CHANGELOG.md updated for non-trivial changes
• Unit tests have been added
• Changes in public API reviewed

[netlify]

✅ Deploy Preview for opentelemetry-cpp-api-docs canceled.

Name	Link
🔨 Latest commit	ae5f50d
🔍 Latest deploy log	https://app.netlify.com/sites/opentelemetry-cpp-api-docs/deploys/67d0c4f5e08c8600084cb80e

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.49%. Comparing base (dee5b0b) to head (ae5f50d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3297   +/-   ##
=======================================
  Coverage   89.49%   89.49%           
=======================================
  Files         208      208           
  Lines        6497     6497           
=======================================
  Hits         5814     5814           
  Misses        683      683           

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