Bump black from 25.11.0 to 25.12.0 in /requirements/partial (#3239)

Author: dependabot[bot]

requirements/partial/requirements_development.txt

@@ -1,6 +1,6 @@
 aiosmtpd==1.4.6
 autoflake==2.3.1
-black==25.11.0
+black==25.12.0
 debugpy==1.8.18
 flake8==7.3.0
 isort==7.0.0