chore(deps-dev): bump boto3-stubs from 1.39.7 to 1.39.8 (#7006)

---
updated-dependencies:
- dependency-name: boto3-stubs
  dependency-version: 1.39.8
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: Leandro Damascena <lcdama@amazon.pt>

Author: dependabot[bot]