Bump debugpy from 1.8.19 to 1.8.20 in /requirements/partial

Bumps [debugpy](https://github.com/microsoft/debugpy) from 1.8.19 to 1.8.20.
- [Release notes](https://github.com/microsoft/debugpy/releases)
- [Commits](microsoft/debugpy@v1.8.19...v1.8.20)

---
updated-dependencies:
- dependency-name: debugpy
  dependency-version: 1.8.20
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements/partial/requirements_development.txt

@@ -1,7 +1,7 @@
 aiosmtpd==1.4.6
 autoflake==2.3.1
 black==25.12.0
-debugpy==1.8.19
+debugpy==1.8.20
 flake8==7.3.0
 isort==7.0.0
 mypy==1.19.1